Inflows to Fontenelle Reservoir for the month of April were 87,000 acre-feet (AF), or 102 percent of average. The current reservoir elevation is 6489 feet, which amounts to 64 percent of live storage capacity. This leaves a volume of 125,000 AF yet to be filled. Over the past week the average inflow rate was 4,010 cubic feet per second (cfs), with daily averages ranging from 2,730 cfs to 5,080 cfs. These flows are exceptionally high for early May and reflect this year’s early spring runoff, as well as recent storm activity.
Fontenelle releases were increased from 1,250 cfs to ~1,700 cfs at the end of March, and have been held steady since that time. It is currently anticipated that releases will be reduced to 1,500 cfs on Thursday, May 21st, in response to a significant reduction in the April-July inflow forecast. However, this is subject to change with information provided in the mid-month forecast (expected Monday, May 18th), which will include the impacts of recent regional storm activity.
Reservoir inflows for the next three months are projected to be well below average with May, June, and July forecasted inflow volumes at 158,000 AF (96% of average), 175,000 AF (58% of average), and 75,000 AF (42% of average), respectively. The May final forecast of the April-July inflow volume is 495,000 AF (68% of average). This represents an 85,000 AF reduction since publication of the April final forecast.
The next Fontenelle Working Group meeting is scheduled for August 26, 2015, at 10:00 am at the Joint Powers Water Board in Green River, Wyoming. The Fontenelle Working Group is an open public forum for information exchange between Reclamation and other parties associated with the operation of Fontenelle Reservoir.
The spring Fontenelle Working Group meeting was held on April 15, 2015 at Seedskadee Wildlife Refuge in Green River, Wyoming. Minutes from the meeting are currently being drafted and will be posted on the Working Group webpages.
Updated May 12, 2015
Email comments/inquires to: ResourceMgr@usbr.gov