Northwest Indian Fisheries Commission



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SSHIAP AquaScape Interactive Mapping Application

Fish Passage Barriers

Defined as natural or anthropogenic features that prevent or inhibit the movement of salmon and steelhead, these include:

SSHIAP recognizes the variable blocking potential (complete, partial, none, unknown, and artificial passage) of barriers with respect to fish species (e.g. swimming capability) and hydrology (e.g. run timing).

Fish passage barrier information within SSHIAP is obtained from a number of sources. These sources include:

Barrier information in the SSHIAP database can be used for answering the following types of questions: