Inseason Forecasts Snake and Columbia Rivers

The Inseason Forecasts tool uses "real time" information about the current status of various Columbia Basin juvenile and adult salmon runs along with current hydrographic information to predict the future progress of the migrating fish. The Inseason Forecasts predictions are available for the following categories.

Smolt Passage

PIT Tag stocks at Lower Granite, Little Goose, Lower Monumental, Ice Harbor, and McNary dams

Arrival distributions, historical timing, transport, and survival for various Snake River yearling chinook, steelhead, subyearling chinook and sockeye stocks. Forecasts are based on PIT Tag detections at Lower Granite Dam.
Current Predictions: 19 September 2021

Passage Index at Rock Island, Lower Granite, McNary, John Day, and Bonneville dams

Arrival distributions and historical timing for combined stocks of yearling chinook, steelhead, subyearling chinook, sockeye, and coho. Forecasts are based on Passage Index data at each dam, individually.
Current Predictions: 19 September 2021

Chelan Passage Counts at Rocky Reach Dam

Arrival distributions and historical timing for yearling chinook, steelhead, subyearling chinook, and sockeye. Forecasts are based on Chelan PUD passage counts at Rocky Reach Dam.
Current Predictions: 31 August 2021

PIT Tag ESU stocks at at McNary, John Day, The Dalles, and Bonneville dams

Arrival distributions, historical timing, and survival for specific Snake River and Upper Columbia River ESU stocks. Forecasts are based on selected PIT Tag detections at McNary Dam.
Current Predictions: 19 September 2021

Adult Passage

Adult Passage stocks at Bonneville and upstream dams

Arrival distributions and total run size for spring and fall adult chinook at Bonneville Dam. Arrival distributions are forecasted to upstream dams for four stocks: Snake River, Upper Columbia River, Lower Columbia River, and Hanford Reach/Yakima. Forecasts are based on visual adult passage counts at Bonneville Dam.
Current Predictions: 19 September 2021

Water Quality

Water Temperature and Total Dissolved Gas

Water temperature and total dissolved gas percent at various dams in the Columbia and Snake rivers. Forecasts are based on observed temperature and total dissolved gas percent data at each location.
Current Predictions: 16 September 2021