The way points of this bicycle route:
Follow the bike path south to the Bridge and crosss to Clarkston taking the sharp right and turning down the twisty trail to the GreenBelt Trail. Head under the Bridge South to Asotin.
Take the sharp right and down the trail.
You'll need to get out on 129 now. The road is narrow and windy but safe enough unless you hit it during fishing season or on a late summer afternoon when the teens are headed for the beaches.
This one lane bridge is a cattlegaurd all the way across. It is rideable if you have the nerve. It's pretty tough to walk across.
The heiroglyphs are on the other sdie of the river but you can find a trail to walk down to the water's edge. We generally turn around here.
Public filshing access but no services.