A GPS survey was conducted on July 10, 2018, to document the CSA pin elevations and cross section geometry at the CSA sensor locations at CSA 09471587 - Dragoon Wash above San Pedro River at St David, AZ, and CSA 09471588 - San Pedro River below Dragoon Wash at St David, AZ. Three CSA pin elevations and cross sections were surveyed at CSA 09471587 - Dragoon Wash above San Pedro River at St David, AZ; and four CSA pin elevations and cross sections were surveyed at CSA 09471588 - San Pedro River below Dragoon Wash at St David, AZ.