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Comprehensive Passage Model (COMPASS)


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The COMPASS Mmodel simulates fish passage and survival over many years relative to hydrology and dam operational rules. The purpose of the model is to predict the effects of alternative operations of Snake and Columbia River dams on salmon survival rates, expressed both within the hydrosystem and as latent effects which that may occur outside the hydrosystem. Accordingly, the model has the following capabilities: 1) realistically simulates survival and travel time through the hydrosystem under variable river conditions; 2) produces results in agreement with available data, particularly PIT-tag data; 3) allows users to simulate the effects of alternative management actions; 4) operates on sub-seasonal time steps; 5) produces an estimate of uncertainty associated with model results; and 6) estimates hydrosystem-related effects that may occur outside of the hydrosystem.

Geographic Location

Developed by Noaa NOAA Fisheries with regional collaboration, the model is specific to the. Columbia River basin with emphasis on federal facilities.


Route specific passage relationships and survival rates


Estimated survival of a scenario across extended range of years

Linkage to Other Models

Relies on hydraulic model for inputs

Level of Effort

Requires information about numerous routes and fairly detailed hydraulic data. Calibration is presently currently to PIT tags, but other basins may not have sufficient numbers of tags released and detected.

Basin Scale Opportunity Assesment