Emergence traps were operated on two streams of Erie County, Pennsylvania Fourmile Creek and Sixmile Creek. The Sixmile Creek collection site was located at 42°7’2”N; 79°57’14”W at an elevation of 360 m approximately 9 km south of Lake Erie. The data were collected from the Sixmile Creek emergence trap from 1977-1986. Fourmile Creek had two sites that were collected from 1980-1992. Site 1 was at 42°7’20”N;79°59’8”W and was located 550 m upstream at an elevation of 326m. Site 2 was at 42°7’15”N;79°59’27”W at an elevation of 275m and was located 90 m downstream from a sewage effluent outfall. The facility was taken out of operation in November 1982. This information should provide flight periods and yearly variations.