San Joaquin, Middle Fork, CA Devils Postpile Nat'l Monument to Mammoth Pool Reservoir Class V+ 32.5 Miles River Description The Middle Fork of the San Joaquin is now getting boated by one or two groups a year in most years. With realtime flow information now available from the Scripps Institute gauge at Devil's Postpile, it seems likely that even more groups will paddle through this incredible canyon. More and more of the drops are being run, but many portages are still necessary. The famous Crucible section is often paddled now, so that big portage has been eliminated by some groups. Put-in elevation: 7,545 feet (2300 meters) Take-out elevation: 3,330 feet (1,015 meters)+- (varies with elevation of Mammoth Pool) TopozoneMap-Devil's Postpile TopozoneMap-Balloon Dome TopozoneMap-Mammoth Pool reservoir Google Earth has excellent hi resolution aerial images of much of this section. Other Information Sources: Devil's Postpile Headquarters: 760-934-2289 <7 rivers Triple Crown story Wikipedia - Devil's Postpile Devil's Postpile Jefferson State Creeking Blog by Darin Mquoid Devil's Postpile V-V+ (P) [Middle Fork San Joaquin] -Day One- Devil's Postpile V-V+ (P) [Middle Fork San Joaquin] -Day Two- Devil's Postpile V-V+ (P) [Middle Fork San Joaquin] -Day Three- A GUIDE TO THE BEST WHITEWATER IN THE STATE OF CALIFORNIA, HOLBEK & STANLEY, 1988 Class: V-VI StreamTeam Status: unverified Last Updated: 2007-02-25 12:40:38

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Gauge Description:

UC San Diego Scripps Institute maintains a weather station at Devil's Postpile for use in climate research. The gauge shows water height rather than cfs.

Dreamflows.com is now estimating the daily average flow at Miller Crossing based on the flow records linked below. Miller Crossing is below the NF confluence, but above the SF confluence. Miller Crossing Map During most of the year this estimate will be very inaccurate because of the effects of rainfall and lower elevation tributaries. However, at the end of the snowmelt season in June, July or August as flows drop below 1,000 cfs, the estimate should generally be in the ballpark, or within a few hundred cfs. It may not be close enough to decide whether to boat or not, but it should be close enough to go look at the river and then decide whether to boat.

The above estimate is based on records from two gauges. There was a gauge from 1921 to 1991 at Miller Crossing, and there is now a daily calculation of Millerton Full Natural Inflow. Comparing these two measurements during the years that have records for both, it appears that during the summer when flows at Miller's Crossing drop into a boatable range, those flows tend to be around 3/10 to 4/10 of the calculated flow at Millerton. The dreamflows calculation is a bit more precise.

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