Water travel route from Billings to New Orleans AI-pedia

The water travel route from Billings, Montana, to New Orleans, Louisiana, is an inland water journey of approximately 3,000 river miles (4,800 kilometers) through the central United States. It begins in the high plains along the Yellowstone River, enters the upper Missouri River near the Montana–North Dakota border, runs through the Missouri's system of large flood-control reservoirs, follows the engineered lower Missouri River to St. Louis, and concludes down the Lower Mississippi River to the Gulf of Mexico port region at New Orleans.

The route spans three distinct hydrological environments. The first is an undammed, gravel-bed mountain river characterized by swift currents, braided channels, and low-head irrigation barriers. The second is an impounded prairie waterway consisting of hundreds of miles of slack water across large reservoirs, where travellers encounter strong headwinds and must carry equipment overland around massive hydroelectric dams. The third is a high-volume, channelized commercial shipping corridor populated by commercial tugboats, barge tows, and deep-draft ocean freighters.

Because there is no continuous, commercially maintained navigation channel on the Yellowstone River or the upper Missouri River, this route cannot be completed in a conventional deep-draft motor vessel without overland transport. It is primarily undertaken as an extended wilderness and endurance expedition by canoeists, sea kayakers, and small-craft expeditioners, or in specialized shallow-draft motorboats equipped for repeated overland hauling.

Route Overview and Physical Geography

The journey passes through or borders ten states: Montana, North Dakota, South Dakota, Nebraska, Iowa, Kansas, Missouri, Illinois, Tennessee, Arkansas, Mississippi, and Louisiana. The entire route is contained within the Mississippi River watershed, which is the largest drainage basin in North America.

Segment	Waterway	Approximate Length	Starting Point	Ending Point	Dominant Hazards
1. Upper Yellowstone	Yellowstone River	360 miles (580 km)	Billings, MT	Confluence near Buford, ND	Braided channels, sweepers, low-head irrigation diversion dams
2. Missouri Reservoirs	Upper Missouri River	950 miles (1,530 km)	Buford, ND	Gavins Point Dam, SD/NE	Open-water fetch, extreme wind, 5 mandatory dam portages
3. Lower Missouri	Lower Missouri River	810 miles (1,300 km)	Yankton, SD	Confluence near St. Louis, MO	Wing dikes, high-velocity boils, barge traffic, debris
4. Lower Mississippi	Mississippi River	830 miles (1,340 km)	St. Louis, MO	New Orleans, LA	Heavy commercial barge tows, massive wakes, ocean ships

From Billings to New Orleans, the river drops approximately 3,100 feet (945 meters) in elevation. The steepest rate of descent occurs along the upper Yellowstone River, where the river drops several feet per mile. The flattest gradient occurs on the Lower Mississippi River, where the drop is often less than one-third of a foot per mile.

Yellowstone River Segment (Billings to Fort Buford)

The route begins on the Yellowstone River in south-central Montana. Billings sits at approximately river mile 360, measuring upstream from the Missouri River confluence. The Yellowstone is notable for being the longest undammed river in the contiguous United States, meaning there are no large hydroelectric or flood-control dams regulating its main stem. Its flow is determined by Rocky Mountain snowpack runoff, resulting in high, muddy, fast-moving water in May and June, followed by much lower, clearer water from late summer through winter.

Channel Structure and Natural Obstacles

The Yellowstone is a braided river—a river that divides into multiple smaller channels that separate and rejoin around islands and gravel bars. Boaters must continuously evaluate which channel carries adequate water depth. Choosing a secondary channel that runs dry or becomes blocked can strand a vessel on shallow gravel or trap it against deadfall.

Instream wood poses a consistent threat along this segment. Strainers—fallen trees lodged in the riverbed that allow water to filter through while pinning boats and people under the surface—frequently accumulate on the outside of river bends where the current erodes the bank. Sweepers are overhanging branches that can knock passengers out of open craft in fast currents.

Irrigation Diversion Dams

Although the Yellowstone has no storage reservoirs, it contains several low-head diversion dams (weirs built across the river to divert water into agricultural canals). These structures create a dangerous hydraulic condition known as a "drowning machine," where water pouring over the crest forms a recirculating surface current that traps floating objects against the face of the dam.

• Huntley Diversion Dam: Located roughly 12 miles downstream from Billings. It is a concrete weir structure that generally requires a portage (carrying the boat around an obstacle over land) along the bank.
• Waco-Custer Diversion Dam: Located near Custer, Montana. It consists of rock and concrete rubble, requiring scouted navigation or a portage depending on the water level.
• Myers Diversion Dam: Located upstream of Forsyth, Montana. This rock weir requires careful alignment or a short land carry along the shoreline.
• Intake Diversion Dam: Located near Glendive, Montana, approximately 70 miles upstream from the Missouri River confluence. Built in 1911 and modified with a fish-bypass channel in 2022, Intake is a major barrier spanning the river. Small craft must either navigate the dedicated bypass channel (if open and conditions permit) or portage across the rocky riverbank to avoid the weir.

The Yellowstone segment ends where it empties into the Missouri River just east of the Montana–North Dakota border, near the historic trading post site of Fort Buford and the modern city of Williston, North Dakota.

Upper Missouri River and the Main-Stem Reservoirs

Upon merging with the Missouri River, the nature of the waterway changes completely. Between Williston, North Dakota, and Yankton, South Dakota, the Missouri River was fundamentally altered in the mid-20th century by the construction of five massive earthen dams built by the U.S. Army Corps of Engineers under the Pick-Sloan Flood Control Act of 1944. These dams created massive impoundments that drowned the natural river channel under slack, deep water.

The Five Reservoirs and Dams

Lake Sakakawea (Garrison Dam): Entering North Dakota, the Missouri slows down and widens into Lake Sakakawea, the third-largest reservoir by surface area in the United States. The lake extends for roughly 178 miles (286 km) to Garrison Dam. It is bounded by barren prairie bluffs, has few protected coves, and is subject to violent prairie storms.

Lake Oahe (Oahe Dam): Below Garrison Dam, a short 80-mile stretch of semi-free-flowing river passes Bismarck, North Dakota, before entering Lake Oahe. Lake Oahe is approximately 231 miles (372 km) long, stretching across the state line into South Dakota and terminating at Oahe Dam near Pierre. It features vast expanses of open water with minimal shoreline shelter, passing through the Standing Rock and Cheyenne River Indian Reservations.

Lake Sharpe (Big Bend Dam): Beginning immediately below Oahe Dam, Lake Sharpe extends roughly 80 miles (130 km) down to Big Bend Dam at Fort Thompson, South Dakota. This reservoir follows a series of dramatic loops, including the geographic feature known as the Great Bend of the Missouri.

Lake Francis Case (Fort Randall Dam): Below Big Bend Dam, the water enters Lake Francis Case, an impoundment that runs for approximately 107 miles (172 km) through southern South Dakota to Fort Randall Dam near Pickstown.

Lewis and Clark Lake (Gavins Point Dam): After a short riverine section below Fort Randall, the river reaches Lewis and Clark Lake, which stretches about 25 miles (40 km) to Gavins Point Dam near Yankton, South Dakota. This is the final main-stem dam on the Missouri River.

Reservoir Hazards: Wind, Waves, and Fetch

The primary hazard on these impoundments is not current, but the complete lack of current combined with wind. The Great Plains experience persistent, high-velocity winds that blow uninterrupted over vast expanses of open water. The distance wind travels over open water without obstruction is known as fetch.

When fetch exceeds several miles, wind generates steep, short-period freshwater waves that can reach heights of 4 to 8 feet (1.2 to 2.4 meters). These waves do not roll smoothly like ocean swells; they are closely spaced and break aggressively, easily swamping open canoes, low-profile touring kayaks, or small motorized runabouts. Strong headwinds can halt forward travel entirely, forcing boaters to remain windbound on desolate shores for days at a time.

Portaging the Dams

None of the five upper Missouri River dams contain navigation locks. They were designed for flood control, irrigation, and hydroelectric power generation, rather than commercial river navigation. Consequently, any vessel travelling downstream must be taken completely out of the water and moved over land around each dam.

Portaging these structures is physically taxing. The dams are vast earthen embankments that are often several miles long and hundreds of feet high. A portage involves hauling a boat and all gear up steep riprap (loose, heavy rock used to armor shorelines), loading it onto a wheeled hand cart or into a motor vehicle, transporting it across access roads, and lowering it back down steep banks into the tailrace water below the powerhouse. Portages at Garrison and Oahe dams can cover road distances of 2 to 5 miles (3 to 8 km).

The Channelized Lower Missouri River (Yankton to St. Louis)

Below Gavins Point Dam at Yankton, the Missouri River resumes an unimpounded, flowing state. The initial 59-mile section to Ponca, Nebraska, is designated as the Missouri National Recreational River and preserves islands, shifting sandbars, and a semi-natural river channel. However, from Sioux City, Iowa, downstream to the confluence with the Mississippi River near St. Louis, Missouri (a distance of roughly 730 miles), the Missouri is heavily modified and channelized.

The Bank Stabilization and Navigation Project

To support commercial barge traffic, the U.S. Army Corps of Engineers engineered the lower river through the Bank Stabilization and Navigation Project. The river was forced into a narrow, continuous, self-scouring deep channel using specific river-training structures:

• Wing Dikes (Groynes): Long, low fingers of heavy rock extending perpendicularly from the riverbank out into the stream. They deflect the water toward the center of the channel, accelerating the current to scour the river bottom to a minimum navigation depth of 9 feet (2.7 meters).
• Revetments: Heavy rock armor laid directly along the outer banks of river curves to halt natural erosion and freeze the river's path permanently in place.
• Chevrons and Weirs: Curved or submerged rock formations placed in the channel to shape flow patterns and direct sediment away from the shipping lane.

Navigation Dynamics and Hazards

The channelization of the lower Missouri creates a fast, uniform current that flows at 3 to 7 miles per hour (5 to 11 km/h). While this current allows for rapid downstream travel, it presents severe hazards:

Boils and Eddies: The intense volume of water moving across underwater rock structures creates surface turbulence known as boils (vertical upwellings of water) and whirlpools. While rarely large enough to sink a modern vessel, they can suddenly twist a boat's rudder or paddle off course.

Notched Dikes and Drowned Rocks: At higher river stages, wing dikes are submerged just beneath the surface. Water flowing over them creates sharp standing waves and violent turbulence. Hitting a submerged rock dike at high speed can puncture hulls or shear off outboard motor propellers.

Commercial Towboats: While commercial shipping on the Missouri River is lighter than on the Mississippi, push-boats (commonly called towboats) regularly push strings of 2 to 6 barges carrying grain, fertilizer, or cement. These barge flotillas cannot turn quickly, take hundreds of yards to come to a complete stop, and throw steep, churning wakes that bounce back and forth between the rock-armored banks without losing energy.

The Mississippi River (St. Louis to New Orleans)

The Missouri River merges with the Mississippi River at river mile 195 above the Ohio River confluence, just north of St. Louis, Missouri. From this point south to the Gulf of Mexico, the waterway becomes one of the world's most heavily trafficked industrial transportation corridors.

The Chain of Rocks and St. Louis Harbor

Just downstream of the confluence, travelers encounter the Chain of Rocks, a natural underwater low-water rock ledge that spans the river channel. Running the Chain of Rocks is extremely hazardous due to severe rapids and submerged rock ledges. To bypass this barrier, vessels typically divert through the Chain of Rocks Canal on the east side of the river, which requires locking through Locks 27—the only navigational lock that small craft may need to enter along this route, although it can be bypassed if portaging around the rapids is coordinated.

Passing St. Louis requires negotiating a congested industrial harbor. The river is lined with industrial terminals, chemical plants, and fleeting areas—designated parking zones along the riverbank where dozens of unpowered steel barges are lashed together awaiting transit. Passing small boats must never venture close to fleeting areas; current sweeping underneath stationary barges creates an inescapable suction hazard.

The Middle Mississippi (St. Louis to Cairo, Illinois)

The 180-mile stretch between St. Louis and Cairo, Illinois, is known as the Middle Mississippi or the "Open River." Unlike the Upper Mississippi north of St. Louis, this section has no locks or dams. It relies on high flow and rock dikes to maintain depth. Current speeds remain high, water turbidity is dense with suspended silt, and barge traffic steadily increases as the river nears the mouth of the Ohio River.

The Lower Mississippi: The Commercial Super-Highway

At Cairo, Illinois, the Ohio River joins the Mississippi, more than doubling its volume. This junction marks the start of the Lower Mississippi River, measured by river miles running backward from Head of Passes at the Gulf of Mexico (Cairo is at Mile 953; New Orleans sits roughly at Mile 100).

The scale of the river here expands dramatically. The channel can exceed a mile in width and reach depths of over 100 feet. The river current carries hundreds of thousands of cubic feet of water per second.

Major Lower Mississippi Hazards

Large Barge Tows: Towboats on the Lower Mississippi are massive vessels generating up to 10,000 horsepower. Instead of the small 4- to 6-barge units seen on the Missouri, Lower Mississippi towboats push flotillas of 30, 40, or even 45 barges lashed together into a single floating unit covering several acres of water.

• Stopping Inability: A loaded 40-barge tow weighs tens of thousands of tons and requires up to a full mile to come to a stop.
• Blind Spots: The pilot sitting in the elevated wheelhouse at the rear of the towboat has a blind zone caused by the forward edge of the barge array that can extend from 300 to 1,000 feet directly ahead of the vessel. Small craft paddling or motoring in this zone are completely invisible to the pilot.
• Wakes: Deep-draft tows displace massive volumes of water. The resulting wake forms long, heavy, breaking rollers that travel across the river and crash violently against the shoreline, easily swamping boats resting near the bank or anchored in shallow water.

Deep-Draft Ocean Shipping (Baton Rouge to New Orleans): Beginning at the Port of Greater Baton Rouge (River Mile 230), the Mississippi is maintained at a minimum depth of 45 to 50 feet to accommodate ocean-going ships. Between Baton Rouge and New Orleans, travelers share the channel not only with barge tows, but with international tankers, bulk cargo ships, and container vessels travelling under their own power. These deep-draft ships travel at high speeds (often 12 to 18 knots relative to the water), generate massive displacement waves, and are restricted strictly to the deepest section of the channel.

Industrial Corridors and Chemical Infrastructure: The reach between Baton Rouge and New Orleans is one of the densest industrial complexes in the world, often referred to economically as the petrochemical corridor. Natural riverbanks are virtually nonexistent here. The shoreline consists almost entirely of concrete sea walls, loading docks, grain elevators, crude-oil transfer stations, and mooring dolphins. Safe landing locations are rare, and mooring to commercial infrastructure without authorization violates federal maritime law enforced by the U.S. Coast Guard.

Vessels, Navigation Logistics, and Equipment

Completing a voyage from Billings to New Orleans requires equipment capable of handling three incompatible water conditions: shallow, fast-flowing gravel shoals; wide, wind-whipped lakes; and heavily industrialized shipping lanes.

Vessel Selection

Because there is no commercial boat hoist system or continuous lock network across the Missouri River dams, large cruisers, traditional houseboats, and deep-draft keelboats cannot complete this trip without hiring commercial flatbed trucking services to bypass hundreds of miles of water.

• Canoes and Tandem Expedition Canoes: Canoes offer high gear capacity, which is essential for carrying weeks of food and water across the upper reservoirs. However, their high freeboard catches wind on Lake Sakakawea and Lake Oahe, making them susceptible to being swamped by open waves or barge wakes unless fitted with spray decks (waterproof fabric covers spanning the open hull).
• Sea Kayaks (Touring Kayaks): Sea kayaks, specifically long (16-to-18-foot) closed-deck models with rudders, are the most seaworthy human-powered craft for the large reservoirs. They cut through wind and rolling chop safely. Their drawback is limited cargo space, which makes carrying adequate drinking water through arid segments difficult.
• Specialized Shallow-Draft Skiffs: Small aluminum jon boats or inflatable crafts equipped with lightweight mud-motors, jet outboards, or traditional small outboards can run the rivers, provided the operators carry portable wheel systems or can arrange vehicle shuttles around the five Missouri dams and several diversion weirs. Deep outboard propellers are easily destroyed on the Yellowstone's gravel beds.

Navigation Rules and Communication

Once downstream of Sioux City—and critically below St. Louis—all vessels are legally subject to the Inland Navigation Rules (codified by the U.S. Coast Guard). Unpowered craft do not automatically have the practical right-of-way over commercial tows; under Rule 9 of the Navigation Rules, small vessels are forbidden from impeding the passage of any vessel that can navigate only within a narrow channel or fairway.

Long-distance voyagers commonly utilize specific maritime communication equipment:

• Marine VHF Radio: A handheld, waterproof VHF radio is necessary on the Lower Missouri and Mississippi rivers. Commercial towboat pilots communicate on VHF Channel 13 (bridge-to-bridge navigation) to coordinate passes. Recreational craft call approaching towboats to state their position and request a passing side (agreeing to pass "on one whistle" / port-to-port, or "on two whistles" / starboard-to-starboard). Channel 16 is monitored for international distress calls.
• Automatic Identification System (AIS): Many modern expeditioners carry portable AIS receivers or smartphone apps tied to GPS to identify commercial tows miles ahead or around river bends. Because the river curves sharply through high levees, tows are frequently invisible to human sight until they are less than a half-mile away.
• Inland River Charts: The U.S. Army Corps of Engineers publishes official navigation charts for the Missouri and Mississippi rivers. These charts indicate every river mile, sailing lines, wing dikes, public access ramps, and barge fleeting locations.

Seasonal Timing and Hydrological Windows

Timing a trip from Billings to New Orleans requires balancing conflicting climate and river patterns:

Season	Yellowstone River	Upper Missouri Reservoirs	Lower Mississippi River
Spring (May–June)	Peak snowmelt runoff; very high, cold, muddy water; high hazard from floating debris.	Cold water temperatures; high risk of fatal hypothermia during wind upsets; frequent storms.	High water stages; strong currents; wing dikes submerged; frequent regional flood crests.
Summer (July–August)	Flow drops sharply; gravel bars exposed; clear water; easier navigation around weirs.	Very hot, dry prairie weather; violent localized thunderstorms; water warm enough to survive immersion.	Water levels drop; massive heat and humidity; potential for early tropical storm or hurricane activity.
Autumn (Sept–Nov)	Very low water; boats may drag on gravel bars; freezing overnight temperatures begin.	Strong autumn cold fronts bring persistent gale-force winds; reservoir freezing begins late November.	Low-water conditions expose extensive sandbars for camping; hurricane season runs through November 30.

Most human-powered expeditions depart Billings in late May or June to take advantage of the Yellowstone's swift snowmelt runoff. This allows travelers to reach the upper Missouri reservoirs during mid-summer, exit Gavins Point Dam by late August, and ride the autumn low-water flow down the Mississippi, reaching New Orleans in October or November before winter freezes the upper continent.

Historical and Environmental Context

Indigenous and Early Expeditionary Travel

Before modern engineering, the Yellowstone, Missouri, and Mississippi rivers formed central trade and migration arteries for Indigenous nations. The Yellowstone basin was home to the Crow (Apsáalooke), while the upper and middle Missouri were inhabited by the Mandan, Hidatsa, Arikara, and various divisions of the Lakota and Dakota peoples. Indigenous craft included the bull boat—a circular, bowl-like watercraft constructed by stretching a single bison hide over a bent willow framework—used primarily for crossing rivers and transporting cargo downstream.

In 1804–1806, the Lewis and Clark Expedition (Corps of Discovery) mapped this corridor for the United States government. While the outward expedition ascended the Missouri River, William Clark led a separate party down the Yellowstone River on the return journey in July 1806. Clark carved his name into Pompeys Pillar—a sandstone formation rising above the river east of Billings—which remains the only physical evidence of the expedition visible on its original site along the route.

The Steamboat Era

During the 19th century, commercial navigation reached far up into these waterways. Specially designed shallow-draft, wood-fired paddlewheel steamboats traveled up the Mississippi and Missouri rivers, eventually making their way into the Yellowstone River to support the fur trade, military forts, and gold prospecting.

In 1876, during the Great Sioux War, the steamboat Far West, piloted by Captain Grant Marsh, navigated the Yellowstone and Bighorn rivers to support the U.S. Army. Following the Battle of the Little Bighorn, the Far West set an endurance record by carrying wounded soldiers down the Yellowstone and Missouri rivers back to Bismarck, North Dakota, traveling 710 miles in 54 hours.

Environmental Changes and Engineering Impacts

The construction of the Pick-Sloan Plan dams flooded more than 550 square miles of fertile bottomlands belonging to Native American reservations in North and South Dakota. The creation of Lake Sakakawea inundated the ancestral lands, towns, and agricultural fields of the Mandan, Hidatsa, and Arikara Nation (Three Affiliated Tribes), including the headquarters town of Elbowoods. The creation of Lake Oahe submerged primary agricultural bottomlands of the Standing Rock Sioux Tribe and the Cheyenne River Sioux Tribe, permanently displacing hundreds of families.

Environmentally, the damming and channelization projects fundamentally altered native river ecology. The trapping of silt behind the upper Missouri dams changed the river downstream from a warm, muddy, sediment-rich waterway into cold, clear reservoir releases. This eliminated spawning habitats for native fish species such as the endangered pallid sturgeon (Scaphirhynchus albus) and the paddlefish (Polyodon spathula), while the replacement of natural shorelines with rock wing dikes destroyed backwater wetlands along the lower river.

Additionally, modern river travelers encounter invasive species throughout the lower half of the system. Asian carp—specifically silver carp (Hypophthalmichthys molitrix)—have populated the Lower Missouri and Mississippi basins. These fish are startled by the vibration of boat hulls and outboard motors, causing them to leap up to 10 feet out of the water. Collisions with leaping 20- to 40-pound carp regularly break equipment and cause physical injury to open-cockpit boaters.

See also

• Yellowstone River
• Missouri River
• Mississippi River
• Pick-Sloan Missouri Basin Program
• Intake Diversion Dam
• Lake Sakakawea
• Lake Oahe
• Chain of Rocks Lock and Dam
• Inland Waterways of the United States
• Port of New Orleans