The crag is just north of Straiton. The climbing is kida fun, little bit dirty and overgrown but nothing that a re-scrub and some more traffic wouldn't clean up. There are ~7 routes in the 5.7 to 5.10 range, all about 20m high and ranging from steep slab through wide crack to vertical face. The rock is granite shot through with basalt dykes. 
  
This is the Sumas Mtn on the BC side of the border not the one in WA.