Delaware reservoirs & dams
Every documented dam and reservoir in Delaware — with normal storage capacity, dam height, max discharge, hazard classification, and drainage area. Sourced from USACE NID and state water-resource agencies.
Storage, hazard, and history
How the Delaware dam inventory breaks down -- aggregate stats computed across every documented dam in the state.
Hazard classification
- High57
- Significant9
- Low17
USACE downstream-consequence rating, not failure likelihood.
Notable dams
- Tallest Newark Reservoir Dam 51 ft
- Oldest Brandywine Creek Dam No. 9 1800
- Total storage All Delaware dams 32,250 ac·ft
Built by decade
Most U.S. dams were built mid-20th century during the federal water-development era.
Delaware dams & reservoirs
Every documented dam in Delaware. Sortable by any column; quickly filterable by name. Numeric columns heat-mapped from light to deep based on value. Tap any dam for the full report.
| Name | Year built | Normal storage | Dam height | Max discharge | Hazard | Drainage area |
|---|---|---|---|---|---|---|
| Bellevue Lake Dam | 1933 | 126 | 15 | 93 | High | 2 |
| Edgemoor Reservoir Dam | 1908 | 0 | 13 | · | High | 0 |
| Porter Reservoir Dam | 1909 | 103 | 12 | 18 | High | 0 |
| Edgar M. Hoopes Dam | 1932 | 6,730 | · | 2,668 | High | 2 |
| Red Mill Pond Dam | 1925 | 218 | 12 | 636 | High | 7 |
| Trap Pond Dam | 1938 | 3,983 | 14 | 3,100 | High | 16 |
| Millsboro Pond Dam | 1920 | 0 | 15 | 1,190 | High | 62 |
| Trussams Pond Dam | · | 476 | 12 | 633 | Significant | 14 |
| Ingram Pond Dam | · | 0 | 12 | 640 | High | 17 |
| Gordons Pond Dam | 1967 | 0 | 7 | 26 | Low | 1 |
| Horseys Pond Dam | 1956 | 689 | 19 | 969 | High | 17 |
| Hudson Pond Dam | 1958 | 151 | 9 | 97 | Low | 5 |
| Fleetwood Pond Dam | 1968 | 102 | 11 | 403 | High | 21 |
| Davis Pond Dam | · | 38 | 10 | 240 | Significant | 6 |
| Mcginnis Pond Dam | · | 228 | 16 | 2,846 | High | 8 |
| Duck Creek Pond Dam | · | 188 | 9 | 917 | High | 18 |
| Lake Como Dam | 1938 | 243 | 15 | 1,180 | High | 6 |
| Masseys Mill Pond Dam | 1933 | 322 | 12 | 325 | Low | 12 |
| Garrisons Lake Dam | 1964 | 840 | 11 | 2,740 | High | 19 |
| Silver Lake Dam - Dover | 1944 | 1,432 | 17 | 5,000 | High | 31 |
| Moores Lake Dam | 1967 | 318 | 14 | 2,057 | Significant | 14 |
| Mudmill Pond Dam | · | 434 | 15 | 1,375 | High | 54 |
| Wyoming Lake Dam | 1925 | 585 | 13 | 2,200 | High | 11 |
| Voshell Pond Dam | 1969 | 0 | 14 | 406 | High | 8 |
| Derby Pond Dam | 1967 | 93 | 10 | 1,437 | High | 5 |
| Andrews Lake Dam | · | 89 | 18 | 2,202 | Significant | 6 |
| Coursey Pond Dam | 1967 | 143 | 20 | 5,798 | High | 21 |
| Killen Pond Dam | 1969 | 645 | 16 | 1,672 | Low | 18 |
| Mccauley Pond Dam | · | 486 | 19 | 6,758 | Significant | 19 |
| Silver Lake Dam - Milford | 1964 | 378 | 13 | 5,040 | High | 27 |
| Haven Lake Dam | · | 0 | 17 | 3,230 | High | 25 |
| Griffith Lake Dam | · | 143 | 13 | 4,743 | High | 11 |
| Concord Pond Dam | · | 1,104 | 14 | 7,700 | High | 63 |
| Brandywine Creek Dam No. 9 | 1800 | 0 | 9 | 1,933 | Low | 304 |
| Sunset Lake Dam | 1900 | 300 | 13 | 259 | High | 8 |
| Becks Pond Dam | · | 140 | 21 | 3,700 | High | 6 |
| Christiana Lake Dam | 1907 | 115 | 17 | 9,112 | Low | · |
| Shallcross Lake Dam | · | 519 | 8 | 1,657 | Low | 6 |
| Noxontown Pond Dam | 1966 | 1,773 | 14 | 1,840 | Low | 10 |
| Silver Lake Dam - Middletown | 1931 | 149 | 18 | 2,100 | High | 7 |
| Wiggins Mill Pond Dam | 1965 | 195 | 17 | 1,917 | High | 5 |
| Abbotts Pond Dam | 1960 | 222 | 15 | 787 | High | 7 |
| Reynolds Pond | · | 385 | 11 | 340 | High | 7 |
| Chipman Pond Dam | 1915 | 183 | 14 | 167 | High | 17 |
| Swiggetts Pond Dam | · | 791 | 12 | 1,330 | High | 11 |
| Records Pond Dam | 1900 | 237 | 25 | 2,535 | High | 75 |
| Collins Pond Dam | 1922 | 1,030 | 11 | 1,713 | Significant | 34 |
| Portsville Mill Pond Dam | · | 73 | 11 | 1,303 | Low | 9 |
| Hearns Pond Dam | 1912 | 1,371 | 14 | 2,574 | High | 13 |
| Wagamons Pond Dam | 1815 | 49 | 17 | 5,472 | High | 22 |
| Burton Pond Dam | · | 245 | 10 | 356 | High | 9 |
| Williams Pond Dam | 1956 | 0 | 14 | 636 | High | 23 |
| Betts Pond Main Dam | · | 171 | 13 | 696 | High | 18 |
| Betts Pond Route 113 Dam | · | 131 | 10 | 994 | High | 17 |
| Morris Millpond Dam | 1929 | 0 | 10 | · | Significant | · |
| Blairs Pond Dam | · | 129 | 15 | 1,076 | High | 10 |
| City Of Wilmington Sewage Lagoon | · | 1,213 | 21 | · | High | 0 |
| City Of Wilmington Sludge Disposal Area | · | 203 | 20 | · | High | 0 |
| City Of Laurel Sewage Lagoon | 1964 | 45 | 13 | · | High | 2 |
| Carousel Pond Dam | · | 0 | 36 | 1,300 | High | 1 |
| City Of Laurel Sewage Lagoon | · | 96 | 15 | · | High | 2 |
| City Of Laurel Sewage Lagoon | 1964 | 96 | 13 | · | High | 2 |
| Goslee Mill Pond Dam | · | 27 | 10 | 600 | Significant | · |
| City Of Harrington Sewage Lagoon | 1971 | 31 | 6 | · | High | 0 |
| Clendaniel Pond Dam | 1810 | 279 | 10 | 279 | High | 9 |
| Cubbage Pond Dam | 1880 | 352 | 11 | 1,362 | High | 10 |
| Tailings Pond No. 1 Dam Getty Oil | 1960 | 0 | 15 | · | Low | · |
| Tailings Pond No. 2 Dam Getty Oil | 1960 | 0 | 15 | · | Low | · |
| Tailings Pond No. 3 Dam Getty Oil | 1960 | 180 | 20 | · | Low | · |
| Marshall Millpond Dam | · | 126 | 14 | 550 | Significant | 7 |
| Diamond Pond Dam | · | 120 | 17 | 90 | Low | 24 |
| Waples Pond Dam | · | 0 | 10 | 700 | Low | 15 |
| Canal Farms Dam | 1962 | 75 | 13 | 110 | Low | 1 |
| Cartanza/Ez Farms Dam | · | 179 | 7 | 1,079 | High | 7 |
| Craigs Pond | · | 180 | 14 | 700 | Low | 8 |
| Lums Pond Dam | · | 0 | 10 | 380 | Low | 4 |
| New Castle County Water Farm Wastewater Lagoon | · | 0 | 29 | · | High | 1 |
| Newark Reservoir Dam | 2005 | 0 | 51 | 180 | High | 1 |
| Rock Manor Golf Course Dam | 2007 | 0 | 24 | 4,522 | High | 1 |
| Shoals Branch Dam | · | 206 | 11 | 454 | High | 7 |
| Town Of Middletown Wastewater Lagoon | · | 293 | 13 | · | High | 1 |
| Town Of Selbyville Wastewater Lagoon | · | 0 | 12 | · | High | 2 |
| Wheatley Pond Dam | · | 53 | 8 | 528 | High | 3 |
About Delaware dams & reservoirs
Where does the Delaware dam data come from?
The U.S. Army Corps of Engineers National Inventory of Dams (NID) plus state water-resource agencies. Snoflo joins these public records with live USGS streamgauge readings downstream where available. The NID is the canonical federal dam registry.
What does Hazard Potential mean?
USACE classifies every dam by what would happen if it failed: Low (no loss of life expected, minimal economic damage), Significant (no loss of life but economic, environmental, or lifeline damage), High (loss of life expected). It's a downstream-consequence rating, not a likelihood of failure.
What is Normal Storage in acre-feet?
The volume of water the reservoir holds at its normal operating level, measured in acre-feet. One acre-foot is about 325,851 gallons or 1,233 cubic meters — the amount needed to cover one acre to a depth of one foot.
Why are some Delaware dams missing storage or height data?
USACE NID records can have gaps for small or older dams that pre-date federal reporting requirements. Snoflo surfaces whatever the canonical record contains. If a dam you care about has incomplete data, contact the operating agency or USACE for updates.
Can I see live water levels?
Yes — tap any dam name to open its detail page, which pulls live storage data from USGS streamgauges or operating-agency feeds where available. Historical levels and seasonal averages are also shown.
Why does Delaware have so many dams?
The U.S. has over 90,000 dams — most built between 1930 and 1980 during the federal water-development era. Delaware's count reflects a combination of agricultural irrigation needs, flood control, hydropower, and recreation. The "Built by decade" chart above shows the timeline.