Grand Coulee, Natural valley in Grant County, Washington.
The Grand Coulee extends for 60 miles from Grand Coulee Dam to Soap Lake, featuring steep cliffs and broad plains divided by Dry Falls.
Massive floods from Glacial Lake Missoula carved this ancient river bed approximately 18,000 years ago when an ice dam released immense water volumes.
The Columbia Basin Project transformed the Upper Coulee into an irrigation network in 1952, altering the ecology while supporting local agriculture and wildlife.
The area contains multiple lakes including Park, Blue, Alkali, Lenore, and Soap Lake, offering opportunities for swimming and water activities.
Research by Joseph T. Pardee and J Harlen Bretz revealed evidence of Ice Age floods in the granite and basalt formations throughout the landscape.
Location: Grant County
GPS coordinates: 47.62000,-119.30800
Latest update: May 27, 2025 09:49
Grand Coulee Dam
44.7 km
Dry Falls
3.8 km
Chief Joseph Dam
48.3 km
Banks Lake
26.1 km
Franklin D. Roosevelt Lake
44.7 km
Moses Lake
53.9 km
Steamboat Rock State Park
30.1 km
Sun Lakes-Dry Falls State Park
4.8 km
Crab Creek
54.5 km
Wells Dam
55.3 km
Withrow Moraine and Jameson Lake Drumlin Field
24.9 km
Lake Chelan Dam
57.9 km
Lake Lenore Caves State Park
23.2 km
Dry Falls Dam
0 m
Bridgeport State Park
49.3 km
Sims Corner Eskers and Kames
23.2 km
Beebe Bridge
54.3 km
Lake Pateros
55.4 km
North Dam
41.8 km
Grand Coulee Bridge
45.5 km
Surf 'n Slide Water Park
54.9 km
Gallaher House
51.2 km
Columbia River Bridge
49.7 km
Grant County Courthouse
38 km
Nifty Theatre
57.2 km
Douglas County Courthouse
57 km
Grant County Fairgrounds
53.2 km
Moses Lake Museum & Art Center
54.5 kmReviews
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