North Dakota Highway 1804 (ND 1804) is a state highway in the U.S. state of North Dakota. ND 1804 and ND 1806 were named to reflect the years of Lewis and Clark's travels through the area, and together constitute the portion of the Lewis and Clark Trail that runs through North Dakota along the northeast and southwest sides of Lake Sakakawea and the Missouri River, respectively.^[1]

Quick Facts Route information, Length ...

North Dakota Highway 1804
Lewis and Clark Trail
ND 1804 highlighted in red
Route information
Maintained by NDDOT
Length	342.805 mi[1] (551.691 km)
Major junctions
South end	SD 1804 near Pollock at South Dakota border
Major intersections	I-94 in Bismarck US 83 from Bismarck to east of Garrison ND 200 in Underwood US 85B west of Williston US 2 in Williston US 85 in Williston
North end	S-327 at Fort Union Trading Post at Montana border
Location
Country	United States
State	North Dakota
Counties	Emmons, Burleigh, McLean, Mountrail, Williams
Highway system
North Dakota State Highway System Interstate US State
← ND 810 → ND 1806

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Highway 1804 begins at the border between North Dakota and South Dakota near Pollock, South Dakota, and continues uninterrupted along the north east side of the Missouri River through Emmons, Burleigh, McLean, Mountrail, and Williams counties. At the intersection of Bismarck Expressway in Bismarck, the highway temporarily splits into a separate northbound route (concurrent with 9th Street) and southbound route (concurrent with 7th Street) until both roads terminate at E Boulevard Avenue in front of the North Dakota State Capitol grounds. Further north in Bismarck, ND 1804 intersects Interstate 94, from which it runs concurrent with US 83 for a short distance.

Just north of Bismarck, ND 1804 diverges from US 83 to closely follow the Missouri River. It once again runs concurrent with US 83 until just northeast of Lake Sakakawea, where ND 1804 permanently diverges west to closely follow the lake. At Williston, a brief concurrence with US 2 and US 85 begins and ends as ND 1804 dips south alongside the Missouri River to meet its final terminus at Montana Secondary Highway 327 in the Fort Union Trading Post National Historic Site.