Big Walnut Creek
|Big Walnut Creek|
Big Walnut Creek in the Three Creeks Metro Park
|Origin||~ 1 mi (1.6 km) southwest of Mount Gilead, Ohio|
|Mouth||Scioto River near Lockbourne, Ohio|
|Source elevation||~ 1,180 ft (360 m) |
|Mouth elevation||~ 665 ft (203 m) |
|Basin area||557 mi² (1,443 km²) |
Big Walnut Creek starts near Mount Gilead, Ohio in Morrow County. It flows south to eastern Delaware County and parallels Alum Creek. It passes to the east of Sunbury and into Hoover Reservoir. The reservoir crosses into Franklin County and flows through Gahanna and Whitehall. Near Obetz it is joined by its principal tributaries Alum Creek and Blacklick Creek at the Three Creeks Columbus Metro Park. It flows through southern Franklin County and joins the Scioto River near the Franklin-Pickaway Counties line.
Variant names 
- Big Belly Creek
- Big Bellys Creek
- Big Lick Creek
- Gahanna River
- Hayes Ditch
- Walnut Creek
- Whingwy Mahoni Sepung
- Menkwi Mhoani Siipunk
- U.S. Geological Survey. Mount Gilead quadrangle, Ohio. 1:24,000. 7.5 Minute Series. Washington D.C.: USGS, 1973.
- U.S. Geological Survey. Commercial Point quadrangle, Ohio. 1:24,000. 7.5 Minute Series. Washington D.C.: USGS, 1988.
- "Map of Ohio watersheds".
- U.S. Geological Survey Geographic Names Information System: Big Walnut Creek