Skip to main content

Washington State Route 155 and the Coulee Corridor

I recently took US 2 across Washington State from Leavenworth to Spokane, but decided to make a detour up to the Grand Coulee Dam. The detour took me up WA 155 from Coulee City along Banks Lake to Grand Coulee, through a place where roads meets epic geologic history. WA 155 is part of the Coulee Corridor National Scenic Byway, boasting quite a number of scenic views as it goes through the Grand Coulee.


The story of this stretch of land begins a long time ago, during the Ice Age. There was a large ice sheet known as the Cordilleran ice sheet that covered western Canada, as well as portions of Idaho, Montana and Washington State. Towards the end of this glaciation, about 12,000-15,000 years ago, a large ice dam blocked the Clark Fork River in the Idaho Panhandle, creating Glacial Lake Missoula. Glacial Lake Missoula was a massive lake 2,000 feet deep, filling the valleys of western Montana, stretching more than 200 miles. At its maximum height and extent, the lake contained more than 500 cubic miles of water. Every so often, the ice dam would fail, resulting in a large catastrophic flood, rushing across northern Idaho and eastern and central Washington, down the Columbia River, through the Columbia River Gorge, and finally poured into the Pacific Ocean at the mouth of the Columbia River.

Thundering waves and chunks of ice stripped away hundreds of feet of soil, carved  mountainsides into deep canyons, or coulees, into the underlying bedrock, deposited giant ripple marks, created the Channeled Scablands of Eastern Washington and carved the Columbia River Gorge. When Lake Missoula burst through the ice dam and exploded downstream, it did so at a rate 10 times the combined flow of all the rivers of the world and at speeds of about 65 miles an hour, draining in as little as 48 hours. This towering mass of water and ice literally shook the ground as it thundered toward the Pacific Ocean. Grand Coulee, along with Dry Falls and Palouse Falls were all were created by these flood waters.

Today, the flooding is over, but the evidence of the Missoula Floods remain. WA 155 travels alongside a canyon that was once one of the channels of the Columbia River during these floods. It makes for a nice and memorable drive as the road meanders along the east bank of the 27 mile long Banks Lake and passes by Steamboat Rock State Park. Let's take a ride now, shall we?


We start near Coulee City, where US 2 veers east through rolling hills and pastures on its way to Spokane. We're some 27 miles away from the Grand Coulee Dam at this point. A few miles southwest of here is Dry Falls, which is an ancient waterfall that was once the world's largest waterfall.

You can start to make out the canyon walls that make up the edges of the coulee. There's also some grazing land for cattle.

Riding the edge of the canyon that will follow the roadway most of the way to the town of Electric City.
I spy a grand opening...

And boom goes the dynamite. That's an incredible view.
Banks Lake to our left, canyon walls to our right.

Obligatory WA 155 shield photo.

Steamboat Rock
Heading into the Northrup Canyon. This is a good area to go hiking and even see bald eagles during the winter.

Back to Banks Lake and canyon walls.
Getting into the outskirts of Electric City...

...and arriving at the junction of WA 155 and WA 174 in Grand Coulee. Both towns are near the Grand Coulee Dam. This is where our story ends, but there is a neat engineering marvel that you should see first.
If you so desire, you can check out the Grand Coulee Dam, which is just a couple miles to the north.


Sources and Links:
Scenic Washington State 365 - Coulee Corridor National Scenic Byway
Montana Natural History Center - Glacial Lake Missoula
The Columbia River: A Photographic Journey - Missoula Floods



How to Get There:

Comments

Popular posts from this blog

The original alignment of US Route 40 over the Martinez-Benicia Ferry and Carquinez Scenic Drive

This past November I took a day trip out to the Carquinez Straights to explore the original alignment of US Route 40 over the Martinez-Benicia Ferry and Carquinez Scenic Drive.



Part 1; the history of road bound travel over the Carquinez Straights

The Martinez-Benicia Ferry began operation in 1847 and is the second oldest ferry in the San Francisco Bay Area.  The Martinez-Benicia Ferry shuttled traffic across the Carquinez Strait long before a bridge was present in the area.   The Martinez-Benicia Ferry was founded by Dr. Robert Semple and was taken over by Oliver Coffin (interesting last name) who built the Ferry Street Wharf in 1850.  The Martinez-Benicia Ferry can be observed even vintage maps such as the 1857 Britton & Rey's Road Map of California.


By 1915 a steam ferry known as the City of Seattle was the first to carry automotive traffic across the Carquinez Strait.  Access to the Martinez-Benicia Ferry was by way of Legislative Route 14 and Legislative Route 7.  LRN…

Box Canyon Road (former US 60, US 70 and the second California State Route 195)

This past month while visiting Riverside County I drove Box Canyon Road from Interstate 10 near Chiriaco Summit southwest to Mecca in Coachella Valley.  Box Canyon Road is mostly known for being the original alignment of US 60/70 when they were expanded into California.


Box Canyon Road is an approximately 15.8 mile road between I-10/Cottonwood Springs Road near Chiriaco Summit which travels southwest through the Mecca Hills to Coachella Valley where it becomes 66th Avenue. 


Box Canyon Road follows a naturally cut wash through the terrain of the Mecca Hills.  The path of Box Canyon Road has been a known route of travel from Coachella Valley to the Colorado River and eastern Sonoran Desert for centuries.  During the California Gold Rush a wagon route known as the Bradshaw Trail was plotted through the Sonoran Desert by William D. Bradshaw.  The Bradshaw Trail was plotted in 1862 through the Sonoran Desert east over the Colorado River to a new mining strike found in La Paz, Arizona.  B…

California State Route 111 in Coachella Valley

This past October I spent some time driving the remaining segments of California State Route 111 in Coachella Valley.


CA 111 is a highway completely contained within the Sonoran Desert of Southern California.  CA 111 begins at Interstate 10 near Whitewater in San Gorgonio Pass of Riverside County.  CA 111 traverses Coachella Valley and the eastern shore the Salton Sea where it terminates at the Mexican Border in Calexico of Imperial County.  Prior to recent relinquished segments CA 111 was 129 miles in length.



Part 1; the History of California State Route 111

CA 111 was one of the original run of Sign State Routes announced in an August 1934 Department of Public Works Guide.  The original route of CA 111 was aligned entirely over Legislative Route 187 between US 60/US 70/US 99 near Whitewater to US 99 in Brawley.  LRN 187 had been added to the State Highway System a year prior in 1933 according to CAhighways.



CA 111 first appears in substantial detail on the 1935 Gousha Highway Map of …