OpenStreetMap

Do you know which road the sign refers to? WA-24 probably doesn't have a name here, but if it does, the intersection is a likely place for the name to change.

WA-24 has the name West Muse Road in OSM a km or so west of this point

The "Muse Rd." sign was indicating the turnoff towards Radar Hill and Mail roads, but it wasn't clear whether this meant that the stub connecting RH to WA-24 is a tiny segment of Muse Road, or whether Muse Rd. was reachable by taking the turnoff. The former seems more likely to me but I am not familiar with the area.

WA-24 used to go to the intersection and make a sharp turn. This turn is south of the sign. Radar Hill continues south and Muse continues east..Muse is currently known by both Mail and Muse but is commonly referred to as Muse Rd. Muse is reached by turning off of WA-24, going south 400 m and turning east

Call are way the hell off. First, highway 24 is on the south side of saddle mountain. Second, muse road I'd in adams County. The pin here is in grant county at the intersection of lower crab creek road and corfu. A few miles south of highway 26.