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Operation of the Garrison Diversion Unit in North Dakota may have various effects on the quantity and quality of streamflow in the Sheyenne River and the Red River of the North. To model the effects that the Garrison Diverson Unit could have on water quantity, monthly gaged and estimated streamflow data and estimated unregulated streamflow data were compiled to develop a complete monthly streamflow record for January 1931 through December 1984 (data-development period) for 29 sites in the Red River of the North basin. Gaged streamflow records were available for January 1931 through December 1984 for only 4 sites; no records or records of various length were available for the remaining 25 sites. Drainage-area ratio and Maintenance of Variance Extension Type 1 methods were used to estimate the streamflow for those sites that had no streamflow record or had a streamflow record available for only part of the data-development period. Unregulated streamflow for the 29 sites was estimated by removing the hydrologic effects of Lake Ashtabula, which is formed behind Baldhill Dam on the Sheyenne River, and surface-water withdrawals. VIater-balance procedures were used to remove the hydrologic effects of Lake Ashtabula from the streamflow record for sites downstream of Baldhill Dam. Mean annual gaged streamflow for the Sheyenne River below Baldhill Dam was 9,175 acre-feet less than mean annual estimated unregulated streamflow for 1950-84, when Baldhill Dam was in operation. Net evaporation losses from Lake Ashtabula account for most of the difference between gaged streamflow and estimated unregulated streamflow. INTRODUCTION The Garrison Diversion Unit in North Dakota was authorized by Congressional Act of August 5, 1965, Public Law 89-108. The Garrison Diversion Unit was to provide for: (1) Irrigation of 250,000 acres, (2) municipal and industrial water, (3) fish and wildlife, (4) recreation, and (5) flood control. The Garrison Diversion Unit Reformulation Act of 1986, Public Law 99-294, specified several modifications and amendments to the 1965 Act. One of the amendments authorized and directed the Secretary of the Interior to construct, operate, and maintain a Sheyenne River water supply and release feature capable of delivering 100 cubic feet per second of water for the cities of Fargo and Grand Forks and the surrounding communities. Water from the Garrison Diversion Unit would be delivered to the upper reaches of the Sheyenne River, which would convey the water to the Red River of the North (pi. 1, in pocket). Operation of the Garrison Diversion Unit in North Dakota may have various effects on the quantity and quality of streamflow in the Sheyenne River and the Red River of the North. Therefore, a technical team, consisting of members from the U.S. Bureau of Reclamation, U.S. Fish and Wildlife Service, U.S. Geological Survey, U.S. Army Corps of Engineers, North Dakota State Water Commission, and the Garrison Diversion Conservancy District, met to discuss the potential effects of the Garrison Diversion Unit on the hydrology of the Sheyenne River and the Red River of the North. Members of the technical team concluded that a model was needed to simulate different hydrologic conditions that could occur during operation of the Garrison Diversion Unit. The Project Canals, Reservoirs, and River Systems model developed by the U.S. Bureau of Reclamation was selected by the technical team for the simulations. An early version of the Project Canals, Reservoirs, and River Systems model was used for the James River in North and South Dakota. Modifications were made to the model by the U.S. Bureau of Reclamation so it could be applied to the Sheyenne River and the Red River of the North. The model uses, as input data, the monthly unregulated streamflow for 29 sites in the Red River of the North basin, 12 of which are in the Sheyenne River basin. Purpose This report describes the compilation and analysis of the monthly streamflow data needed as input to the Project Canals, Reservoirs, and River Systems model. The specific objectives were: (1) Compile and estimate the streamflow data for 1931-84 (the data-development period) for 29 sites within the Red River of the North basin, 12 of which are in the Sheyenne River basin (pi. 1); and (2) estimate the unregulated streamflow for 1931-84 for the 29 sites. The 29 sites include gaging stations for which some records are available and sites for which no records are available. The 29 sites where streamflow data were needed are listed in the following table. Gaged streamflow records were available for January 1931 through December 1984 for only 4 sites; no records or records of various length were available for the remaining 25 sites. Unregulated streamflow was determined by adjusting the gaged and estimated streamflow to reflect the absence of water-resource developments. Description of Study Area The Red River of the North basin is part of the Hudson Bay drainage system (pi. 1). Parts of South Dakota, North Dakota, and Minnesota in the United States, and parts of Saskatchewan and Manitoba in Canada are drained by the Red River of the North. The North Dakota-Minnesota boundary is formed by the Red River of the North. Drainage area of the Red River of Site Gaging station number Gaging station or site name number 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. Red River of the North at Fargo, N.Dak. Sheyenne River above Harvey, N.Dak. Sheyenne River near Warwick, N.Dak. Sheyenne River near Cooperstown, N.Dak. Baldhill Creek at the mouth Sheyenne River below Baldhill Dam, N.Dak. Sheyenne River at Valley City, N.Dak. Sheyenne River at Lisbon, N.Dak. Sheyenne River near Kindred, N.Dak. Sheyenne River at West Fargo, N.Dak. Maple River at the mouth Rush River at the mouth Sheyenne River at the mouth Buffalo River at the mouth Elm River at the mouth Wild Rice River at the mouth Red River of the North at Halstad, Minn. Goose River at the mouth Marsh River at the mouth Sand Hill River at the mouth Red Lake River at the mouth Red River of the North at Grand Forks, N.Dak. Turtle River at the mouth Forest River at the mouth Snake River at the mouth Park River at the mouth Red River of the North at Drayton, N.Dak. Pembina River at the mouth Red River of the North at Emerson, Man. 05054000 05054500 05056000 05057000 05058000 05058500 05058700 05059000 05059500

Gaged and estimated monthly streamflow during 1931-84 for selected sites in the Red River of the North basin in North Dakota and Minnesota