American, Middle Fork, California, US
-1) Interbay Dam to Oxbow Reservoir (End of the World)
||IV-V (for normal flows)
General CharacterPhoto by Chris Tulley taken 05/17/11
Summary: This is
great wilderness run. Good mix of boulder gardens and bedrock rapids. IV+ to V- in
difficulty. First 3 miles of run are mostly high quality IV+ / V-. Then, gradient
mellows and the next 4-5 miles slide away quickly with some occasional class IV to keep you on
your toes. Then, you cash out on the gradient bank with the last ½ mile being the
steepest of the run. The inconsistent gradient/difficulty keeps this run from being a
classic. Most similar comparisons would be to Canyon creek (SF Yuba trib), SF T, and
Lavazola. Predictable ideal flows (even simple gauge readings) would yield paddlers here on
a regular basis.
Flow: Currently the crux of End of the World is finding the right
flow. American Whitewater is working to secure access to PCWA (Placer County Water
Authority) gauges and hosted a flow study in 2010. Note: Based on the algae growth in
the riverbed, it appears this run has boatable flows much more often than common wisdom in
paddling circles would suggest.
Minimum = ~300 cfs at PI, ~400 by takeout
Medium = 500-600 at takeout
High = ???
One tributary (Mosquito creek) joins the run approx mi
2.5-3. In May of a big water year, this added about 30cfs.
Put-in: End of the
World Power House, sometimes referred to as Interbay Dam (~2440’). Paved roads all the
way. From the take out drive up Mosquito Ridge Road, then turn right on the road leading to
Interbay Dam and Middle Fork Powerplant. Access the river a short ways below the
Area just above Oxbow Res (~1160’). River Right just above brigde. Paved roads
all the way.
recommended but not mandatory.
· (Low water only) shallow rapid where the river bends to the left
in the first Quarter mile. Potential portage to avoid shallow
· ~1/2 mile above Takeout. Double drop of ~10’ into a stout hole w/
undercut on the left + sieve on the right.
· ~1/2 mile above Takeout. Ledge hole of ~8’, highest drop viewable
from takeout road. Note this has a must make eddy on the river left that is
challenging. Many would choose to walk the rapid above instead of chance making this eddy.
Many folks keep walking from the prior portage on the left. It is a tough (5-10
min) portage and some oak but most conservative V boaters agree it is worth it to just
A solid crew of class V boaters should budget ~5
Other Information Sources:
Middle Fork American River Project Relicensing
Resources Overview pdf
Placer County Water Agency
Upper American River Foundation
UCDavis Hydra Center, flow study news release
StreamTeam Status: Not Verified
Last Updated: 2011-06-14 02:57:44