continuous array
partial record
minor site
Solid teal = array operating in ≥14 of the last 15
years; hollow orange = partial record — its first "hot" year may be
the antenna switching on, not fish arriving. Dot size = lifetime adult
detections. Drag to pan, scroll to zoom.
Adult-confirmed detections only: an arrival is the array's first detection of a
fish after its adult dam-ladder passage, so outbound June smolts never enter
the timing signal (June holds 0.06% of all arrivals here; the spring mass is
adults moving up to spawn). Historical and static: this page is rebuilt with the
model on the Mac, not by the daily update. Arrays under 50 lifetime adult
detections appear as small gray dots — still monitored, too thin to chart
(Newsome Creek, for example, has 2,786 detections but they are outbound smolts:
six of its tags ever returned as adults, none detected there again).
River lines and distances: USGS NHDPlus flowlines (NLDI
downstream-mainstem navigation); "km up" is river distance to the river's
mouth — its Snake or Columbia confluence. Basemap tiles: USGS The
National Map (public domain).