From May 22 to September 7, 1956, eight tests were made involving the passage of varying numbers of fish through an overfall-type fishway. The fishway, which was 6 feet wide, consisted of 6 pools (1 foot rise between pools) each 16 feet long with an average depth of 6.3 feet. In the tests, from 70 to 2886 fish entered the fishway during 1-hour periods. The median passage time for fish to ascend the 6-pool fishway ranged from 12 to 35 minutes. The effect of pattern of flow and other criteria on fish passage is discussed.