Difficulty IV-V
Length 10.06 Miles
Gauge N/A
Flow Range
Reach Info Last Updated 06/12/2019 9:11 pm

River Description

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 dam. 
Takeout: Picnic Area just above Oxbow Res (~1160’). River Right just above brigde. Paved roads all the way.
Portages: Two 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 boulder jumble
·         ~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 keep portaging.

A solid crew of class V boaters should budget ~5 hours.   


Other Information Sources:
Middle Fork American River Project Relicensing
Existing Resources Overview pdf
Placer County Water Agency
Upper American River Foundation
UCDavis Hydra Center, flow study news release

Rapid Descriptions


No Gage

Gage Descriptions

 Flows between 425 and 480 were reported to be good during the May 2010 boating study.   Effects of flows outside that range are untested. 

Historical records are available at:
MF American below Interbay - USGS #11427770 
Ralston Powerhouse - USGS#11427765

Directions Description

We have no additional detail on this route. Use the map below to calculate how to arrive to the main town from your zipcode.

Date Flow Result Factor  
1974-05-11 n/a Fatality Other Read More




Paul Martzen


Chris Tulley


Matt Muir


Revision #Revision DateAuthorComment
1197925 07/07/10 Paul Martzen n/a
1198750 05/17/11 Chris Tulley update w/ first hand experience
1197926 07/08/10 Paul Martzen mileage, elevation, links
1200175 05/23/11 Matt Muir Added sig photo & abstract.
1200269 06/11/11 Chris Tulley update from first hand experience from boating 6/10/11. Edited flow window and portages based on new flow run
1200273 06/14/11 Chris Tulley Updated portage info w/ more detailed specifics to avoid hazards.
1212892 06/12/19 Chris Tulley updated image position