| Cool Branch | |
| Name Other: | Tributary to Tubbs Branch |
| Map Size: | 180 |
| Pushpin Map: | USA Delaware#USA |
| Pushpin Map Size: | 180 |
| Pushpin Map Caption: | Location of Cool Branch mouth |
| Pushpin Map Alt: | Map of Cool Branch mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Delaware |
| Subdivision Type3: | County |
| Subdivision Name3: | Sussex |
| Length: | 2.85miles[1] |
| Discharge1 Location: | Tubbs Branch |
| Discharge1 Avg: | 2.71cuft/s at mouth with Tubbs Branch[2] |
| Source1: | Tyndall and James Ditch divide |
| Source1 Location: | about 2 miles northwest of Sycamore, Delaware |
| Source1 Coordinates: | 38.6067°N -75.5275°W[3] |
| Source1 Elevation: | 39feet[4] |
| Mouth: | Tubbs Branch |
| Mouth Location: | about 0.5 miles south of Concord, Delaware |
| Mouth Coordinates: | 38.6319°N -75.5608°W |
| Mouth Elevation: | 18feet[5] |
| Progression: | Tubbs Branch → Deep Creek → Nanticoke River → Chesapeake Bay |
| River System: | Nanticoke River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Bridges: | Cool Branch Road, Fire Tower Road, Bunny Lane |
Cool Branch is a 2.85miles long 2nd order tributary to Tubbs Branch in Sussex County, Delaware.
Cool Branch rises about 2 miles northwest of Sycamore, Delaware, and then flows northwest to join Tubbs Branch about 0.5 miles south of Concord.[5]
Cool Branch drains of area, receives about 45.0 in/year of precipitation, has a wetness index of 681.87, and is about 8% forested.[2]