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San Pedro Riparian. National Conservation. Area boundary. USDA-ARS Walnut Gulch Experimental Watershed. Upper San Pedro River Basin. ARIZONA. 20 km. Tombstone. Subwatershed Boundary. Major Drainage (Ephemeral). 4 km. Rainguage. Benson. Energy/CO2 Flux Station. 100. USGS gauge.
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San Pedro Riparian National Conservation Area boundary USDA-ARS Walnut Gulch Experimental Watershed Upper San Pedro River Basin ARIZONA 20 km Tombstone Subwatershed Boundary Major Drainage (Ephemeral) 4 km Rainguage Benson Energy/CO2 Flux Station 100 USGS gauge USGS gauges Coshocton, Ohio Sierra Vista 10 Mean Annual Runoff (inches) USA Reisel, Texas MEXICO San Pedro, AZ 1 ? SONORA Walnut Gulch, AZ 0.1 0.1 10 1000 0.001 Area (sq. miles)