Click here for current conditions at Trinity Lake (inflow, outflow, reservoir storage, and lake level).
Forecast Lake Elevations
USBR Forecast from March, 2015. The graphic below will be updated if new B2 water forecasts from the U.S. Bureau of Reclamation become available.
UPDATE IN PROGRESS
The 50% forecast estimates lake levels under average conditions. This forecast essentially says that 50% of the time, there will be more water in the lake than the forecast indicates.
The 90% forecast is a conservative estimate that represents lake levels under very dry conditions. This forecast essentially says that 90% of the time, there will be more water in the lake than the forecast indicates.
*The data for the figure is from the U.S. Bureau of Reclamation’s B2 water forecast (see Water Ops Summary under Operations Analysis and Accounting). Forecasts are typically provided monthly from November to May in the latter half of each month. As the season progresses, snowpack and rainfall totals are better known so summer forecast levels tend to converge. One or both forecasts may not be updated in spring if little change in the values is expected.