Speight's Run is a 197-acre lake that overflows into Lake Kilby. The lake is separated into two sections, split by Route 645 (Manning Road) off Route 58 in Suffolk. The upper section is closed to public fishing due to the lack of any public access. The lake contains abundant largemouth bass, bluegill, crappie, and redear sunfish, with perhaps the latter species being most noteworthy. Bass in the 12-15 inch range are very abundant. Since the lake gets very little fishing pressure, angling success rates are generally high.
Permits are required, as for the other Portsmouth lakes. Bank fishing is prohibited and gas motors (up to 10 horsepower) are allowed. On the lower lake, there is a paved ramp with limited parking located at the dam on Route 688, south of the intersection of Business Route 58 and Route 58 bypass.