Now, May, June, July, Aug, Sep and Oct................................ Above the Dam ought to be getting hot for Catch and Release right now.... I assume your talking about below the dam, just remember it closes above the marker line on 1 May... See if they change this here soon............ Or next year?

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STURGEON May 1-Aug. 31: CLOSED to fishing for STURGEON from Bonneville Dam downstream 9
miles to a line crossing the Columbia from Navigation Marker 82 on the Oregon shore through the upstream
exposed end of Skamania Island, continuing in a straight line to a boundary marker on the Washington shore.
STURGEON Jan. 1-July 31 Min. size 38" fork length. Max. size 54" fork length. Daily limit 1.
STURGEON may be retained Thursdays, Fridays, and Saturdays
only.
STURGEON Aug. 1-Oct. 7 Catch-and-release.