Last Monday, August 2nd, I rode the Alameda Creek Trail from Coyote Hills to Mission Blvd.  There is a construction detour that reroutes riders from the south side of the creek to the north side, gravel trail. On the west side, where the detour crosses under 880, the trail becomes steep sand.  And where it emerges on the east side, it's steep, deep stones - not gravel.  Caution is advised.