Weaver's Mill Covered Bridge, also known as Isaac Shearer's Mill Bridge, carries a road over the Conestoga River in Lancaster County, Pennsylvania. Built in 1878 by B. C. Carter and J. F. Stauffer, it is an 85-foot-long, 15-foot-wide single-span bridge supported by wooden double Burr arch trusses reinforced with steel hanger rods. Painted red inside and out, with white approaches, it follows the traditional appearance of Lancaster County covered bridges. Its importance as part of Pennsylvania's covered-bridge heritage was formally recognized when it was listed on the National Register of Historic Places in 1980.