Erb's Covered Bridge over Hammer Creek in Lancaster County, Pennsylvania
|Mouth||Cocalico Creek at Rothsville, Pennsylvania|
|Basin countries||Lebanon and Lancaster Counties, Pennsylvania, United States|
|Length||19.2 miles (30.9 km)|
|Source elevation||308 feet (94 m)|
|Basin area||40 square miles (100 km2)|
Hammer Creek is a 19.2-mile-long (30.9 km) tributary of Cocalico Creek in Lancaster County, Pennsylvania in the United States. Hammer Creek is dammed to form Speedwell Forge Lake below joining the Cocalico Creek approximate with Middle Creek near the village of Rothsville.
Variant names 
See also 
- Geographic Names Information System. "GNIS entry for Hammer Creek (Feature ID # 1198070)". Retrieved 2011-06-15.
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed August 8, 2011
- Gertler, Edward. Keystone Canoeing, Seneca Press, 2004. ISBN 0-9749692-0-6
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