Eastern terminus of Spirit Lake Highway after May 18th eruption (36074...
The temporary eastern terminus of the Spirit Lake Highway (SR 504) after the 1980 eruption of Mt. St. Helens
Toutle River Bridge after 1980 Mount St. Helens eruption
Aerial view of flooded area at State Highway 504 bridge just below the confluence of the North Fork and South Fork Toutle River, northwest of Mount St. Helens.
Kid Valley bridge on SR 504, July 1980
The Kid Valley bridge, carrying State Route 504 over the North Fork Toutle River, was left intact after the lahar of Mount St. Helens's May 1980 eruption destroyed the highway's other major bridges.
Mount St. Helens mudflow deposit on State Highway 504 near Toutle, 198...
Mudflow deposit covering State Highway 504 near the town of Toutle, northwest of Mount St. Helens, to a depth of 2 m (6 ft). Geologist for scale.
Mudflow covering SR 504 near Coal Bank bridge, July 1980
Sedimentary deposits from the lahar of Mount St. Helens's May 1980 eruption, seen covering State Route 504 a few months later. USGS employee Gordon Coyier is seen posing next to a buried highway sign.
SR 504 - Coal Bank bridge after lahar
The remains of the Coal Bank bridge on State Route 504, destroyed during the lahar of Mount St. Helens's May 1980 eruption.
WA-504 St. Helens Bridge after 1980 eruption
The 75-m (247-ft) St. Helens bridge on State Highway 504 after May 18 eruption of Mount St. Helens when it was washed out by the mudflow on the North Fork Toutle River. This steel structure was carried about ha... More
WA-504 St. Helens Bridge prior to eruption
The 75-m (247-ft) St. Helens bridge on State Highway 504. View before May 18 eruption of Mount St. Helens.