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.
|MF SAN JOAQUIN R NR MAMMOTH LAKES CA|
|usgs-11224000||100 - 250 cfs||V+||01h11m||32.3 cfs (too low)|
Reports give the public a chance to report on river conditions throughout the country as well as log the history of a river.