EFFECTS OF FLUCTUATING FLOW RATES 



143 



LAKE HUDSON 



CHIMNEY 



ROCK 



RESERVOIR 



STATE 

 HIGHWAY 33 



GRAND RIVER 



FORT GIBSON 



Fig. 1 Map of study area showing locations of seven sampling 

 stations in the Grand River drainage basin, Mayes County, Okla- 

 homa. U. S. Geological Survey gauging stations are located at two 

 sites (A and B) along the Grand River. During period of maximal 

 water storage in Fort Gibson Reservoir, water flows upstream in 

 Chouteau Creek (C-1 and C-2) and Pry or Creek (P-1 and P-2), and 

 the flow rate on the Grand River is slow. During periods of water 

 release from both Fort Gibson Reservoir and Lake Hudson, 

 downstream flow rates rapidly increase at all stations. Station G-1 is 

 subject to frequent daily fluctuations in water level and flow rates as 

 a result of releases from Lake Hudson. 



