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We evaluated maps of runoff created by means of two automated procedures. We implemented each procedure using precipitation estimates of both 5‐km and 10‐km resolution from PRISM (Parameter‐elevation Regressions on Independent Slopes Model). Our goal was to determine if using the 5‐km PRISM estimates would improve map accuracy. Visual inspection showed good general agreement among our runoff maps, as well as between our maps and one produced using a manual method. A quantitative uncertainty analysis comparing runoff interpolated from our maps with gage data that had been withheld showed slightly smaller actual and percentage interpolation errors for the 5‐km PRISM‐based maps. Our analyses suggest a modest region‐wide improvement in runoff map accuracy with the use of PRISM‐based precipitation estimates of 5‐km (compared to 10‐km) resolution.