Hurricane Paine, extending across the Central Plains of the United States, caused flooding of unprecedented proportions in the Caney River. This storm produced a rainfall varying from 20 to 30 inches in Oklahoma during September 29 through October 4, 1986. Because of the severity of this extreme event, local residents questioned the adequacy of the bridges on the Caney River at U.S. 75. As a result, the Oklahoma Department of Transportution (ODOT) initiated this research investigation as an objective study of the hydraulic capacity of the bridges to convey floodwaters and the policies and procedures used in the design. This report presents hydrologic data, flood analysis, water surface profiles for 50-, I 00-year, and the 1986 Flood due to the old bridge and new bridge, and hydraulic damage analysis. Computer analysis indicates that the construction of the new bridge causes backwater effect in the range of I to 2 feet and maximum velocity between 6 to 8 feet per second for 50- and I 00- year floods. The computer analysis further indicates that construction of the new bridge has resulted in lowering the water surface elevation by 2 to 3 feet when compared to the old bridge without Hulah and Copan Lakes, a condition that existed in 1930 at the time of construction of the old bridge. In addition, a review of policies and procedures of ODOT and the new bridge design on U.S. 75 on the Caney River shows that the design is within the guidelines. A second report, Volume II, containing hydrologic and computer analyses accompanies this report.