Washington 504
Washington 504
| Termini | I-5 (exit 49) and WA-411 in Castle Rock to the Johnston Ridge Observatory in the Mount St. Helens National Volcanic Monument |
| Length | 51.8 miles |
| "Where does it go?" | WA-504 is the Spirit Lake Memorial Highway. It runs from Castle Rock through Toutle and Kid Valley, to Coldwater Ridge and into the Monument. The highway east of Toutle was destroyed by the overview of debris into the Toutle River from the eruption of Mount St. Helens in 1980. The highway has been rebuilt high up from the river. |
| EB Miles | Eastbound down | Westbound up | WB Miles | Google™ | Multiplex | Near City or Town |
County |
| 0.0 |
  Huntington Ave |
51.8 |
  |
Spirit Lake Memorial Highway | Castle Rock | Cowlitz | |
| 0.1 |
 |
51.7 |
|
||||
| 0.2 | Old Pacific Highway | 51.6 |
|
||||
| 2.0 | Tower Rd | 49.8 |
|
||||
| 5.6 | Seaquest State Park | 46.2 |
|
||||
| 10.5 | Sightly Rd | 41.3 |
|
Toutle | |||
| 13.6 | Tower Rd | 38.2 |
|
||||
| 14.7 |
 |
37.1 |
|
||||
| 21.0 |
 Sediment Dam Rd |
30.8 |
|
Kid Valley | |||
| 26.7 | Hoffstadt Viewpoint | 25.1 |
|
||||
| 40.2 | Castle Lake Viewpoint | 11.6 |
|
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| 43.0 | Coldwater Ridge Complex | 8.8 |
|
Mount St Helens National Volcanic Monument | |||
| 49.0 | Tunnel Outlet Viewpoint | 2.8 |
|
Skamania | |||
| 51.8 | Johnston Ridge Observatory | 0.0 |
|
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Highways of
Washington State - State Route 504
Wikipedia -
Washington State Route 504
Washington
State Legislation - Route 504