| Sawmill Branch | |
| Name Other: | Tributary to Smyrna River |
| Map Size: | 180 |
| Map Alt: | Map of Sawmill Branch mouth |
| Pushpin Map: | Delaware#USA |
| Pushpin Map Size: | 180 |
| Pushpin Map Alt: | Location of Sawmill Branch mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Delaware |
| Subdivision Type3: | County |
| Subdivision Name3: | New Castle |
| Length: | 7.28miles[1] |
| Discharge1 Avg: | 12cuft/s at mouth with Smyrna River[2] |
| Source1: | Blackbird Creek divide |
| Source1 Location: | Pond about 0.5 miles east-southeast of Blackbird, Delaware |
| Source1 Coordinates: | 39.3628°N -75.6406°W[3] |
| Source1 Elevation: | 55feet[4] |
| Mouth: | Smyrna River |
| Mouth Location: | about 1.5 miles southeast of Chambersville, Delaware |
| Mouth Coordinates: | 39.3486°N -75.5575°W |
| Mouth Elevation: | 0feet |
| Progression: | southeast |
| River System: | Smyrna River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | DE 1, Black Diamond Road, Eagles Nest Landing Road, Deer Run Road, Walker School Road, Paddock Road |
Sawmill Branch is a 7.28miles long 2nd order tributary to Smyrna River in New Castle County, Delaware.
According to the Geographic Names Information System, it has also been known historically as:[3]
Sawmill Branch rises in a pond on the Blackbird Creek divide about 1.5 miles southeast of Blackbird in New Castle County, Delaware. Sawmill Branch then flows southeast to meet the Smyrna River about 1.5 miles southeast of Chambersville, Delaware.[4]
Sawmill Branch drains of area, receives about 44.0 in/year of precipitation, has a topographic wetness index of 589.76 and is about 18.8% forested.[2]