Techniques are presented for estimating the magnitude ant frequency of floods on Ohio streams. .Regression analysis is used to develop equations which relate physical and climatic factors of river basins to peak discharge at stream gaging stations. The equations can be used to estimate flood magnitudes with recurrence intervals from 2 to 100 years on drainage areas between 0.01 and 7,400 square miles (0.03 to 19,200 square kilometers). A summary of flood and watershed data for gaging stations with 10 or more years of record is included. .Records for 215 gaging stations are used to develop the regression equations. Flood records of streams with significant regulation or urbanization are excluded from this analysis.