I used to have a condo on the 17th fairway of the Leavenworth golf course, thus fishing the Icicle on recent years openers and the main Wenatchee when it was legal back when.

used to launch the DB at 230am to get a decent anchoring spot in one of the 3 sometimes 4 fish producing holes. Even then, I would run into boats that had anchored over night; tarps for cover, sleeping bags etc.
that Icicle springer season is one ridiculous fishery that will wear you out.

golfing in the afternoons was better but fresh springer on the barbee in the evenings really sealed the trips!
I did well with sand shrimp and pink yarn, no bobber or spinnglo. Anchored to bottom via wire spreader & cannonball. Plunked and wait for the bite...