Aug 2026
The outlet tubes are full, and the water is coming out under pressure.
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| Facebook Reel |
It looks like Ohio got some of that rain that caused record flooding in Central and Southeast Indiana.
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| WaterData |
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| TheDaytonMagazine "How the Germantown Dam is made up" This is one of five dry dams that was built after the 1913 flood to reduce flood damage |
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| TheDaytonMagazine |
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| OhioMemory, cropped "A conservancy road goes across the top of the dam. The dam was built to temporarily store floodwater and has no gates or permanent pool. It is 1,210 feet long and 100 feet high. There are two concrete conduits through the base of the embankment at the north abutment. The conduits are sized to discharge a peak flow during an Official Plan Flood 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 in a low area through the left abutment north of the dam." |
At first, I could not find the spillway. But the above "An emergency spillway is located in a low area through the left abutment north of the dam." allowed me to find it.
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| Satellite |
It appears that the 31.5' depth in the above water data chart is about twice as high as the conduit. The dam is 100' high.
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| mcdwater_2025 "Germantown Dam is an earthen embankment that spans 1,210 feet across Twin Creek....It’s capable of storing up to 34.55 billion gallons of floodwater and managing it through two massive conduits — each 546 feet long, 9.1 feet high, and 13 feet wide — that run through the bottom of the dam." |
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| mcdwater_2025 [I agree that the concrete needed to be repaired.] |
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| mcdwater_2025 |
It is the right descending conduit that was repaired.
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| dayton447now The flood control project included 55 miles of levees and channelization of parts of the river to accommodate the full output of the conduits. |
More importantly than the dam being 100' high, the spillway is about 80' high. So, a water depth of 31.5' is a rather small fraction of the reservoir since the capacity increases as the water goes up because the water spreads out over more land.
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| 1960/62 Farmersville Quad @ 24,000 |
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