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Figure 1.--Colorado River, eight miles North of Grand Lake, Colorado. 
Color infrared film, Nikon 50mm lens, Wratten 12 filter, 1 f stop 
overexposure, 1000 feet above datum, maximum water depth 2.7 feet 
upstream from beaverdams. October 20, 1975. 
  
Figure 2.—-Red and Rio Grande River May 5, 1977 photographed at 
2000 feet with Nikon F2 50mm lens Wratten 3 filter with 2 f stop 
overexposure, Ektachrome X film. Stream bottom of both streams can 
be clearly observed.