Rotary screw traps (RSTs) are used to monitor downstream migration of salmonids throughout the Willamette Valley basin. The locations of the RSTs, years of operation, and operator IDs are described in the map below, and in an interactive data table.
This map includes several locations which were estimated or assumed from previous years. Scroll further down the page to see a map of only verified locations.
Below, you can interact with the map using your cursor. Hovering over a project, river, reservoir, or other feature will open help-text that explains what is under your cursor. You can also click-and-drag over areas of the map to zoom in. Double-click to zoom back out.
Focal subbasins are purple, and focal projects and reservoirs are gold. Pink circles represent pre-injunction RST sites, blue triangles represent post-injunction sites. Black circles are USGS gages used during analysis (e.g., to verify hydrological data reported at USACE projects, during trap efficiency analysis, and as covariates in statistical models).
Here is the data used to populate the map above, but in table form. Using the inputs at the top of each column, you may filter the data to specific years, locations, etc.
Below, you can interact with the map using your cursor. Focal subbasins are purple, and focal projects and reservoirs are gold. Pink circles represent pre-injunction RST sites, blue triangles represent post-injunction sites.
Hovering over a project, river, reservoir, or other feature will open help-text that explains what is under your cursor. You can also click-and-drag over areas of the map to zoom in. Double-click to zoom back out.