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Notes:

These data are redd counts by river km from 2007 in the Yakima River

X axis = river km with 0 representing the downstream extent of our survey (Ellensburg)
Y axis = redds/km

Notable landmarks are shown according to where they occur along the river

Tributary junctions occur immediately downstream of local maximums in spawning density.
The hatchery and upper acclimation facility may also be helping to extend the distribution of spawners
But, what is the distribution of wild and hatchery fish building these redds?