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

Paper Highways; California State Route 1 through the Lost Coast

For all the accolades and praise that California State Route 1 gets for being a top notch coastal highway one fact tends to get overlooked; the highway was never finished!  In this edition of Paper Highways we look at the failed path of California State Route 1 through the Lost Coast.



Part 1; the history of Legislative Route 56 and California Route 1 through the Lost Coast

The Lost Coast region consists of the undeveloped coastal areas of Humboldt County, Mendocino County, and the King Range.  The Lost Coast region roughly spans from near Rockport in Mendocino County north to Ferndale of Humboldt County.  The Lost Coast region is known for having rugged terrain which rivals what is seen in Big Sur.  The Lost Coast has several small communities such as; Shelter Cove, Whitehorn, and Petrolia.

In 1933 Legislative Route 56 was extended south to LRN 2 (US 101) near Las Cruces and north to Ferndale to LRN 1 (also US 101).  Prior to 1933 the legislative description of LRN 56 had it's nort…

Where the hell is Hill Valley? (US Route 8 south/US Route 395 east)

Recently I made a visit to Universal Studios near Los Angeles.  While on the back lot tour I came across a piece of infamous movie-borne fictional highway infamy; the location of town square of Hill Valley, California on US Route 8/US Route 395.


The above photo is part of the intro scene to the first Back-to-the-Future movie which was set in 1985. To anyone who follows roadways the signage error of US 8 meeting US 395 in California is an immediately notable error.  For one; US 8 doesn't even exist anywhere near California with present alignment being signed as an east/west highway between Norway, Michigan and Forest Lake, Minnesota.  To make matters worse US 8 is signed as a southbound route and US 395 (a north/south highway) is signed as an eastbound route.  At minimum the cut-out US 8 and US 395 shields somewhat resemble what Caltrans used in the 1980s.

Assuming Hill Valley is located on what would have been US 395 by 1985 what locales would be a viable real world analog?  US 39…

US Route 99 to Visalia?...

Something that I noticed awhile back while doing map research regarding US Route 99 in Fresno was that the highway intended to be originally routed through the City of Visalia.



The early originally planned alignment of US Route 99 in Visalia

To be clear US 99 was never actually routed through Visalia and ended up bypassing the City in favor of a direct route from Goshen southeast to Tulare.  US 99 within San Joaquin Valley was aligned over Legislative Route 4 which in turn was added to the State Highway System as part of the 1909 First State Highway Bond Act.  LRN 4 for a time was aligned through Visalia via; Mineral King Avenue, Main Street, and Mooney Boulevard.  This early alignment of LRN 4 through Visalia can be seen on the 1924 Division of Highways State Map.


The initial draft of the US Route System was approved by the Secretary of Agriculture during November of 1925.  The US Route System with in California was approved by California Highway Commission with no changes recommended…