This photo needs editing.
Difficulty V+
Length 32.5 Miles
Gauge MF SAN JOAQUIN R NR MAMMOTH LAKES CA
Flow Range 100 - 250 CFS
Flow Rate as of: 1 hour ago 224 [CFS] ℹ️
Reach Info Last Updated 09/29/2010 4:48 pm

River Description


The Middle Fork of the San Joaquin is now getting boated by one to several groups a year in most years.   It seems likely this incredible canyon will become steadily more popular.

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.

Season:  This reach must be boated as flows drop near the very end of the run off season.  Often this will be in July.  In wet years, the best boating levels could be in August. 

Put-in elevation: 7,545 feet (2300 meters)
Take-out elevation: 3,330 feet (1,015 meters)+- (varies with elevation of Mammoth Pool)

Google Earth has excellent hi resolution aerial images of much of this section.

Put in:  
It is not legal to paddle within Devils Postpile itself, so hike boats downstream on the trail to the monument boundary before launching.


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

Rapid Descriptions

Miller's Crossing

Class - N/A Mile - 20
Rapid Thumbnail Missing

A trail crosses the river here.   A gauging station operated just upstream of the bridge into the 1980's.

Comments

Gage Descriptions

USGS #11224000 streamgauge is now operating at the upstream end of Devil's Postpile Monument.   Side streams will add flow over the entire distance of the run, so flows must be on the low side at the put in to insure they are not too high near the end of the section.  In 2010, Kevin Smith reported a trip that "put on with 170 on the new DPP gauge and had a medium/high flow."    It seems likely that the ratio between the put in flow and the take out flow will vary from year to year, especially between wet or dry years. 

 

UC San Diego Scripps Institute maintains a weather station at Devil's Postpile for use in climate research. The gauge showed water height rather than cfs, but was nice the one year that it operated properly.   Unfortunately there have been problems and the station has not been transmitting data properly.   It has not provided online data for several years.


Dreamflows.com has estimated 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 dreamflows 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.

Directions Description


The fastest way between Devil's Postpile and Mammoth Pool is over Tioga Pass through Yosemite, down Highway 41, turn off to the Bass Lake, then take Beasore Road to Grizzly Rd to Minarets and Mammoth Pool. 

 

The map below shows driving through Bass Lake to North Fork and then up the Minarets/Mammoth Pool road.   However, the Beasore route  might save as much as 15 to 30 minutes.  From Bass Lake, take Beasore Road (5S07) then Grizzly Road (6S01).   A few miles before Minarets Rd, Grizzly Rd forks at a campground.   The left fork (6S01) crosses a creek and turns to dirt.  The right fork (6S71) is paved. 

 

National park fees are required to pass through Yosemite and to enter Devils' Postpile Monument.    One time permits are good for 7 days.

Date Flow Result Factor  
2014-06-09 Medium Near Miss/Rescue Other Read More

Alerts

News

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Devils Postpile Will Be Included in Wild and Scenic Inventory!

2/21/2019
Theresa Simsiman

Good news from California! After the Inyo National Forest Plan Revision Objection Resolution meeting yesterday in Bishop California, the Deputy Regional Forester and the Inyo Forest Supervisor announced that they will add the segments of the Middle Fork San Joaquin that are on Inyo Forest land (11.5 miles) to the inventory of eligible wild and scenic rivers for the revised Inyo Forest Plan.  They will also add whitewater boating as an outstandingly remarkable value (ORV).  Specifically, the sections of the Middle Fork San Joaquin within the Inyo National Forest from Soda Springs footbridge to the confluence with the North Fork San Joaquin.

article main photo

AW Recommends California Rivers for Wild and Scenic

2/9/2016
Megan Hooker

Last week, American Whitewater recommended that the U.S. Forest Service assess whether numerous whitewater rivers in California are eligible for Wild and Scenic status. The agency is currently revising Forest Plans for the Inyo, Sequoia and Sierra National Forests, and this process provides an opportunity to evaluate rivers for whether they are eligible for Wild and Scenic designation. If a river is found eligible through this process, the Forest Service protects the values that could make it worthy for Wild and Scenic designation, including its free-flowing characteristics. 
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New Flows For the San Joaquin

4/19/2007
Dave Steindorf

American Whitewater has signed another important settlement in California.  This agreement will restore flows, remove small dams and provide public flow information on the San Joaquin. 
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Paul Martzen

Revisions

Revision #Revision DateAuthorComment
1190084 05/04/09 Paul Martzen n/a
1198275 09/29/10 Paul Martzen directions - more
1198274 09/29/10 Paul Martzen Shuttle directions
1198089 08/19/10 Paul Martzen Linked photo to main page
1197839 06/17/10 Paul Martzen added gauge, coordinates and links