Gauge Description:

In 2008, flows are expected from Nov. 9 through Friday Nov. 14.

In 2007, flows did not occur due to Kerchoff dam maintenance
In 2006, flows were from mid October to Friday November 17.
In 2005, flows ended on Friday Nov. 18th.
In 2004 the window ended on November 19.
In 2003 the flow window started on Saturday November 8 and ran through Dec 5.

Local whitewater representatives must contact PG&E each year to find out approximately from what date to what date the Kerchoff #1 powerhouse will be in operation in the Fall. Once they report which weeks the powerhouse is in operation, the following information can indicate what times during the day it is operating.


To estimate what times the powerhouse is running, Look at the daily fluctuations or slope changes on the Millerton Elavation Graph. When the slope is donwards inflow is less than outflow. When the slope is level, inflow is equal to outflow. When the slope is upwards, inflow from the powerhouse is higher than outflow from the reservoir. The most up to date inflow and outflow numbers are 24 hour averages from the previous day, available after midnight at Millerton daily report (pdf). Look at the total average release from Friant Dam and that number is what the inflow has to be whenever the graph above is level. Also look at the inflow number on the daily report. If the number is around 1,000 cfs then the old powerhouse should be running close to 24 hours a day. As the total inflow drops lower than that amount, the powerhouse is probably operating for fewer hours (rather than lower flows). If inflow is greater than 1,000 cfs, then it is likely that some spill is occuring in Patterson Bend. (In the past this powerhouse consistently released around 1,700 cfs, but in recent years the maximum output seems to be around 1,000 cfs. P.M. - 2006)

As stated above, inflows to Millerton are an indication of flows in K1 to K2 only for a few weeks each fall, when the Kerchoff #1 Powerhouse is operating. The rest of the year, inflows indicate releases from Kerchoff #2 powerhouse into the Millerton Bottoms section. . The USGS links for the two powerhouses show historical data and show what dates the powerhouses were on or off in previous years.

The Millerton Stats page also gives information about the reservoir, including a 24 hour average inflow (though always 2 days late).



Reports give the public a chance to report on river conditions throughout the country as well as log the history of a river.

When River/Gauge Subject Level Reporter
San Joaquin [CA] Damn He's Good 850 cfs n/a
San Joaquin River [CA] Evan Emerging 850 cfs +- Paul Martzen
> 10 years @San Joaquin 5. K1 to K2 (Kerckhoff #1 PH to Kerckhoff #2 PH) [CA] Paul Run of Lower Falls 850 cfs n/a
> 10 years San Joaquin [CA] Lower Falls; slideshow 900 cfs Paul Martzen
> 10 years San Joaquin [CA] Another Look ? n/a
> 10 years @San Joaquin 5. K1 to K2 (Kerckhoff #1 PH to Kerckhoff #2 PH) [CA] Bottom of Upper Falls 4200 cfs n/a
> 10 years San Joaquin [CA] Evan's Discription 4700 cfs n/a
> 10 years San Joaquin River [CA] Daniel in Left Chute 850 - 1000 cfs ? Paul Martzen
> 10 years San Joaquin [CA] Uh Oh! 850 ? Paul Martzen