Big Walnut Creek
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, which then crosses into Franklin County. From the dam outflow in Westerville the creek 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 at 39°47′57″N 83°00′34″W.
| Big Walnut Creek | |
|---|---|
The confluence of Big Walnut Creek and Alum Creek at Three Creeks Metro Park | |
| Physical characteristics | |
| Source | |
| • location | ~ 1 mi (1.6 km) southwest of Mount Gilead, Ohio |
| • elevation | ~ 1,180 ft (360 m) |
| Mouth | |
• location | Scioto River near Lockbourne, Ohio |
• elevation | ~ 665 ft (203 m) |
| Basin size | 557 sq mi (1,440 km2) |
| Discharge | |
| • location | Rees |
| • average | 529.4 cu ft/s (14.99 m3/s), USGS water years 1974-2019 |
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