Fossil Creek (Mt. St. Helens)

Fossil Creek is a significant tributary of the Kalama River. This page describes two canyon destinations in upper headwaters, located southwest of Mt. St. Helens. The two tributaries can be run individually or combined for a full day out. East Fossil is a bit more technical and has more water. Access to both is easy, minimal creek walking, and with two high-clearance vehicles you can even shuttle it. Water can be very cold early in the season. Visit earlier in the season for more water. Water levels dropped by 50% or more between early May and mid-June 2025. East Fossil might need some high water anchors to run earlier in the season.

Drop a car at the bottom and shuttle (or walk) the road up to the top. 2.3mi, +650ft elevation. High-clearance vehicles recommended per water damage and some car-sized potholes. Note that the road may be blocked by snow into April. Subaru-friendly in 2025. From the junction (~2700ft elevation), bushwhack southwest for two minutes and drop into West Fossil just above R1. Creek is brushy for a moment or two.

This section of the creek is entirely within Gifford Pinchot National Forest. The upper creek is fairly action-packed with minimal walking between rappels. Some of the drops look like potential jumps, but scout them first. Creek-walk downstream ~500ft to the next rappel. Creek-walk downstream ~400ft to the final rappel. Partway down pass someone's homemade bridge crossing the creek with a rope to hang onto. What's this about? Presumably intended for use in high flow or you could just rock-hop across. Potential exit by clambering up handline ropes DCL here, but it's probably easier 100ft downstream. Downclimb a final cascade to: Exit the creek DCL above or below R9 and ascend ~100ft to old decommissioned logging grade. Follow right/downhill to the road (~1min). Continue to follow the road downhill for 0.5mi and drop into East Fossil at the crossing. This section of the creek is on land owned by Tall Corn Forestry. Please respect all postings as access could be restricted any time. Check out the enormous culvert (big enough to drive a car through) underneath the road. Clearly this creek sees enormous floods from time to time. Water levels will likely be twice that of West Fossil, so evaluate carefully if you want to continue.

From the final rappel, continue downstream ~300 yards. Watch carefully for a large Doug Fir, still living, that's fallen across the creek. On the far side, scramble out DCL (easy) onto an abandoned logging road. There used to be a bridge here once, but it appears to have either been removed or destroyed. Follow the abandoned road grade south about 0.7mi on a gentle rising traverse to the gate and your waiting car. Admire the fine collection of giant culvert pipes along the way. Declare victory.