- Effects of wastewater effluent on the South Platte River from Littleton to Denver, by Norman E. Spahr and Steven R. Blakely
- Variations in climatic characteristics as related to evapotranspiration in South Park, central Park County, Colorado, by Norman E. Spahr ; prepared in cooperation with the City and County of Denver, Board of Water Commissioners
- Interim results of quality-control sampling of surface water for the Upper Colorado River National Water-Quality Assessment Study Unit, water years 1995-96, by Norman E. Spahr and Robert W. Boulger
- Water quality in the Upper Colorado River Basin, Colorado, 1996-98, by Norman E. Spahr [and six others]
- Reservoir evaporation in central Colorado, by Norman E. Spahr and Barbara C. Ruddy ; prepared in cooperation with the Denver Water Department
- Estimation of evaporation from Ned Wilson Lake, Flat Tops Wilderness area, Colorado, by Norman E. Spahr and John T. Turk
- Water-quality characteristics of the Slate and East Rivers, Colorado, during the winter recreational season, December 1996, by Norman E. Spahr and Jeffrey R. Deacon
- Comparison of 2002 water year and historical water-quality data, upper Gunnison River basin, Colorado, by N.E. Spahr ; prepared in cooperation with the City of Gunnison ... [and others]