Fort MandanAbout Fort Mandan
Fort Mandan was the winter encampment of the Lewis and Clark Expedition during 1804-1805, located beside the Mandan villages on the Missouri River in what is now North Dakota. It served as the Corps of Discovery’s base for wintering, trading with local Indigenous nations, and preparing for westward travel.
Today the site is interpreted with a reconstructed fort and museum displays that explain the construction of the stockade, interactions with the Mandan and Hidatsa peoples, and expedition logistics. The replica and interpretive programs provide seasonal living-history activities and educational exhibits.
The original fort was erected by members of the expedition under Captain Meriwether Lewis and Captain William Clark; after the expedition departed the structure did not survive long-term. The modern reconstruction and interpretive facilities were developed to commemorate the expedition’s winter at Mandan.
The reconstructed site and interpretive center are located near Washburn, North Dakota, on the banks of the Missouri River in central North Dakota.
- Historical role: The original Fort Mandan was the Corps of Discovery’s winter camp for 1804-1805 and was located near the Mandan villages on the Missouri River.
- Visitor location: A modern replica and interpretive displays are located near Washburn, North Dakota, for public education and seasonal programs.
What to See#
- Replica fort: A reconstructed blockhouse-style fort that interprets the winter quarters built by the Lewis and Clark Expedition in 1804-1805.
- Interpretive center: An adjacent interpretive center and outdoor exhibits providing context about the Mandan and Hidatsa villages and Corps of Discovery activities during the winter of 1804-1805.
Best Time to Visit Fort Mandan
Best late spring through summer for programming and access.
Weather & Climate near Fort Mandan
Fort Mandan's climate is classified as Warm-Summer Continental - Warm-Summer Continental climate with warm summers (peaking in July) and freezing winters (coldest in January). Temperatures range from -17°C to 28°C. Semi-arid with limited rainfall.
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | - | -17° - -6° | -19° | 11 mm | - | - | 4.8 m/s | - | - |
| February | - | -14° - -2° | -15° | 9 mm | - | - | 4.8 m/s | - | - |
| March | - | -8° - 4° | -7° | 17 mm | - | - | 4.9 m/s | - | - |
| April | - | -1° - 13° | 2° | 47 mm | - | - | 5.1 m/s | - | - |
| May | - | 6° - 20° | 13° | 56 mm | - | - | 5.2 m/s | - | - |
| June | - | 11° - 25° | 18° | 83 mm | - | - | 4.6 m/s | - | - |
| July | - | 13° - 28° | 21° | 62 mm | - | - | 4.1 m/s | - | - |
| August | - | 12° - 28° | 20° | 48 mm | - | - | 4.2 m/s | - | - |
| September | - | 7° - 22° | 15° | 45 mm | - | - | 4.5 m/s | - | - |
| October | - | 1° - 15° | 5° | 26 mm | - | - | 4.7 m/s | - | - |
| November | - | -7° - 4° | -7° | 11 mm | - | - | 4.6 m/s | - | - |
| December | - | -15° - -4° | -16° | 12 mm | - | - | 4.7 m/s | - | - |
How to Get to Fort Mandan
Fort Mandan historical site is near Washburn, North Dakota. Access is by road; the site has parking and interpretive signage. Confirm seasonal hours and programming with local tourism offices.
Tips for Visiting Fort Mandan
- Visit the reconstructed stockade and interpretive panels to understand the Lewis & Clark era context.
- The site is rural and signage is modest - bring a map or GPS coordinates to find the location.
- Summer evenings can be buggy near the river; plan accordingly.