Washington State Route 504
- Washington State Route 504
infobox WA State Route
type=WA
route=504
sec=655
parent=5
parent_type=Interstate
length_mi=51.76
length_ref=[cite web|author=Washington State Department of Transportation|url=http://www.wsdot.wa.gov/mapsdata/tdo/PDF_and_ZIP_Files/HwyLog2006.pdf|title=State Highway Log, 2006|accessdate=2007-04-22] ]
length_round=2
formed=1964
dir1=West
dir2=East
from=
junction=
to=Johnston Ridge at Mt. St. Helens
previous_type=WA
previous_route=503
next_type=WA
next_route=505
State Route 504 (also known as the Spirit Lake Memorial Highway), is a highway that runs east from Castle Rock, Washington for 52 miles to its present terminus at Johnston Ridge Observatory at the northern base of Mount St. Helens. Other places of interest along this highway include the Mount St. Helens Visitor Center (which is part of the Washington State Park System), and the Coldwater Ridge Visitor Center.
Previous to the May 18, 1980 eruption of Mount St. Helens, S.R. 504 ran alongside the North Fork of the Toutle River to end at Spirit Lake, but this course was rendered impassable due to the lahars that followed the eruption. From the community of Toutle, the course of this highway was later relaid several hundred feet above the river valley. Sections of the newly realigned State Route 504 were completed in 1992, 1994 and in 1997. A short section of the original roadway (also known as Sediment Dam Road) is maintained as SR 504 Spur, providing access to a scenic viewpoint, as well as a Washington State Department of Transportation maintenance shed.
East of Toutle, where it enters the Gifford Pinchot National Forest, there is only one gas station, and no cell phone coverage.fact|date=April 2007
References
* [http://apps.leg.wa.gov/RCW/default.aspx?cite=47.17.655 RCW 47.17.655: Legal definition of SR 504]
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