Oldest Dams in Delaware

Delaware has 47 dams with recorded construction dates. The oldest dates to 1800 — 226 years ago. Delaware's earliest dams were built in the 19th century, an era of westward expansion, irrigation development, and early water infrastructure. Older dams require particular attention for safety, as many were built before modern engineering standards.

#	Dam	County	Year Built	Age	Height (ft)	Hazard	Condition
1	Brandywine Creek Dam No. 9	New Castle	1800	226 yrs	9	Low	Not assessed
2	Clendaniel Pond Dam	Sussex	1810	216 yrs	10	High	Not assessed
3	Wagamons Pond Dam	Sussex	1815	211 yrs	17	High	Fair
4	Cubbage Pond Dam	Sussex	1880	146 yrs	11	High	Fair
5	Sunset Lake Dam	New Castle	1900	126 yrs	13	High	Not assessed
6	Records Pond Dam	Sussex	1900	126 yrs	25	High	Satisfactory
7	Christiana Lake Dam	New Castle	1907	119 yrs	17	Low	Not assessed
8	Edgemoor Reservoir Dam	New Castle	1908	118 yrs	13	High	Not assessed
9	Porter Reservoir Dam	New Castle	1909	117 yrs	12	High	Fair
10	Hearns Pond Dam	Sussex	1912	114 yrs	14	High	Satisfactory
11	Chipman Pond Dam	Sussex	1915	111 yrs	14	High	Fair
12	Millsboro Pond Dam	Sussex	1920	106 yrs	15	High	Poor
13	Collins Pond Dam	Sussex	1922	104 yrs	11	Significant	Fair
14	Wyoming Lake Dam	Kent	1925	101 yrs	13	High	Fair
15	Red Mill Pond Dam	Sussex	1925	101 yrs	12	High	Fair
16	Morris Millpond Dam	Sussex	1929	97 yrs	10	Significant	Not assessed
17	Silver Lake Dam - Middletown	New Castle	1931	95 yrs	18	High	Fair
18	Edgar M. Hoopes Dam	New Castle	1932	94 yrs	127	High	Satisfactory
19	Masseys Mill Pond Dam	Kent	1933	93 yrs	12	Low	Not assessed
20	Bellevue Lake Dam	New Castle	1933	93 yrs	15	High	Not assessed
21	Lake Como Dam	Kent	1938	88 yrs	15	High	Fair
22	Trap Pond Dam	Sussex	1938	88 yrs	14	High	Fair
23	Silver Lake Dam - Dover	Kent	1944	82 yrs	17	High	Fair
24	Horseys Pond Dam	Sussex	1956	70 yrs	19	High	Fair
25	Williams Pond Dam	Sussex	1956	70 yrs	14	High	Fair
26	Hudson Pond Dam	Sussex	1958	68 yrs	9	Low	Poor
27	Tailings Pond No. 1 Dam Getty Oil	New Castle	1960	66 yrs	15	Low	Not assessed
28	Tailings Pond No. 2 Dam Getty Oil	New Castle	1960	66 yrs	15	Low	Not assessed
29	Tailings Pond No. 3 Dam Getty Oil	New Castle	1960	66 yrs	20	Low	Not assessed
30	Abbotts Pond Dam	Sussex	1960	66 yrs	15	High	Fair
31	Canal Farms Dam	New Castle	1962	64 yrs	13	Low	Not assessed
32	Garrisons Lake Dam	Kent	1964	62 yrs	11	High	Fair
33	Silver Lake Dam - Milford	Kent	1964	62 yrs	13	High	Fair
34	City of Laurel Sewage Lagoon	Sussex	1964	62 yrs	13	High	Fair
35	City of Laurel Sewage Lagoon	Sussex	1964	62 yrs	13	High	Fair
36	Wiggins Mill Pond Dam	New Castle	1965	61 yrs	17	High	Not assessed
37	Noxontown Pond Dam	New Castle	1966	60 yrs	14	Low	Not assessed
38	Derby Pond Dam	Kent	1967	59 yrs	10	High	Fair
39	Coursey Pond Dam	Kent	1967	59 yrs	20	High	Fair
40	Moores Lake Dam	Kent	1967	59 yrs	14	Significant	Fair
41	Gordons Pond Dam	Sussex	1967	59 yrs	7	Low	Not assessed
42	Fleetwood Pond Dam	Sussex	1968	58 yrs	11	High	Fair
43	Voshell Pond Dam	Kent	1969	57 yrs	14	High	Not assessed
44	Killen Pond Dam	Kent	1969	57 yrs	16	Low	Not assessed
45	City of Harrington Sewage Lagoon	Kent	1971	55 yrs	6	High	Fair
46	Newark Reservoir Dam	New Castle	2005	21 yrs	70	High	Fair
47	Rock Manor Golf Course Dam	New Castle	2007	19 yrs	24	High	Fair

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