Photo: Ryan Hulvat
Huffman Dam is an earthen embankment located across the Mad River in northwestern Greene County near the City of Fairborn. A maintenance road/bike trail goes across the top of the dam. Construction of the dam began in January of 1918 and was completed in December of 1921.
The dam has three concrete conduits through the base of the embankment near the left abutment. The conduits are sized to discharge floodwaters at a rate that can be handled by the flood protection levees and channels downstream. The remainder of the floodwaters are temporarily stored behind the dam and released over time. An emergency spillway is located directly above the conduits in the same structure.
Huffman Dam Statistics
- 3,340 feet long
- 65 feet high
- 385 feet wide at dam base
- 1.655 million cubic yards of earth in the embankment
- Three concrete conduits
- Each conduit is 40 feet long, 16.3 feet high and 15 feet wide.
- The spillway is 100 feet long
- Volume of concrete in the conduits and spillway is
40,000 cubic yards.
- Drainage area above Huffman Dam is 671 square miles.
Elevation and Hydraulic Information
- Elevation of the dam is 850 feet above sea level.
- Peak elevation Probable Maximum Flood is 842 feet above sea level.
- Spillway elevation is 835 feet above sea level.
- Peak elevation Official Plan Flood (OPF) is 835 feet above sea level.
- Elevation where storage begins is 788 feet above
- Peak discharge for OPF is 35,000 cubic feet per second.
- Time to empty the storage area after an Official Plan Flood is five days.
- Water stored to the spillway would inundate 9,180 acres of land upstream from Huffman Dam. The 167,000 acre-feet of water would extend along the Mad River eight miles, to a point just south of the Village of Medway in Clark County.
Directions to Huffman Dam