Tallest Dams in Maryland

Maryland has 420 dams with recorded heights. The tallest is Jennings Randolph Dam at 296 feet. Taller dams impound more water and carry greater potential energy, which is why height is a key factor in hazard classification and inspection requirements.

#	Dam	County	Height (ft)	Type	Purpose	Hazard	Year
1	Jennings Randolph Dam	Mineral	296	Rockfill	Flood Risk Reduction	High	1981
2	Savage River Dam	Garrett	184	Earth	Flood Risk Reduction	High	1952
3	Liberty Dam	Baltimore	175	Gravity	Water Supply	High	1953
4	Prettyboy Dam	Baltimore	155	Gravity	Water Supply	High	1936
5	T. Howard Duckett Dam	Howard	139	Buttress	Water Supply	High	1953
6	Loch Raven Dam	Baltimore	130	Gravity	Water Supply	High	1923
7	Druid Hill Lake Reservoir And Storage Tanks	Baltimore City	118	Earth	Water Supply	High	1871
8	Little Seneca Dam	Montgomery	99	Earth	Water Supply	High	1984
9	Rocky Gap Dam	Allegany	98	Earth	Water Supply	High	1969
10	Conowingo	Cecil	94	Concrete	Hydroelectric	High	1928
11	Deep Creek Dam	Garrett	85	Earth	Hydroelectric	High	1925
12	Brighton	Montgomery	82	Buttress	Hydroelectric	High	1943
13	Hunting Creek Dam	Frederick	79	Earth	Water Supply	High	1969
14	Cove Point Lng Main Dam	Calvert	78	Earth	Recreation	Significant	1974
15	Lake Frank	Montgomery	78	Earth	Recreation	High	1967
16	Piney Run Dam	Carroll	73	Earth	Water Supply	High	1974
17	York Bldg Products Settling Pond 12	Cecil	70	Earth	Tailings	Significant	2004
18	Mason-dixon Water Supply Pond	Cecil	67	Earth	Other	Low	1966
19	Prince Frederick Wwtp Pond 2	Calvert	65	Earth	Other	Low	2002
20	Lake Needwood	Montgomery	65	Earth	Recreation	High	1965
21	Warner Gap Hollow Dam	Washington	65	Earth	Water Supply	High	1902
22	Seneca State Park Dam (seneca Creek Road)	Montgomery	64	Earth	Recreation	High	1975
23	Greenbrier State Park Dam & Dike	Washington	64	Earth	Recreation	High	1965
24	Lake Linganore	Frederick	63	Earth	Recreation	High	1972
25	Mt. Soma Reservoir	Harford	61	Earth	Water Supply	High	2018
26	Little Youghiogheny Site 6 (broadford)	Garrett	60	Earth	Water Supply	High	1971
27	Pecks Branch Dam (ashburton)	Baltimore City	59	Earth	Other	High	1956
28	Atkisson Reservoir	Harford	59	Concrete	Water Supply	High	1942
29	Fishing Creek Dam	Frederick	58	Earth	Water Supply	High	1925
30	Mason Dixon Original Settling Pond	Cecil	52	Earth	Tailings	Low	1966
31	York Bldg Products Settling Pond 11	Cecil	51	Earth	Tailings	Significant	1999
32	Don Pleasants Dam	Allegany	50	Earth	Recreation	Significant	1977
33	Lake Marian (woodridge Road)	Frederick	50	Earth	Recreation	Low	1973
34	Beechtree Dam	Prince George's	50	Earth	Irrigation	Low	2002
35	Cecil Sand And Gravel Pond 6	Cecil	49	Earth	Tailings	Significant	2006
36	York Bldg Products Settling Pond 10	Cecil	48	Earth	Tailings	Significant	1991
37	Jennifer Road Swm Route 50 And Route 2 (sha Bmp 020259)	Anne Arundel	47	Earth	Flood Risk Reduction	Significant	1985
38	Montebello Waste Water Lake	Baltimore City	46	Earth	Other	Low	1915
39	Chesapeake Ranch Estates Dam (chisolm Trail)	Calvert	46	Earth	Recreation	High	1965
40	Frostburg Reservoir	Garrett	46	Earth	Water Supply	High	1990
41	York Bldg Products Settling Pond 13	Cecil	45	Earth	Tailings	Significant	2016
42	Little Youghiogheny Site 5	Garrett	45	Earth	Flood Risk Reduction	High	1968
43	Little Youghiogheny Site 7	Garrett	45	Earth	Flood Risk Reduction	High	1960
44	Little Deer Creek Site 3	Harford	45	Earth	Flood Risk Reduction	Significant	1962
45	Little Deer Creek Site 1	Harford	45	Earth	Recreation	Significant	1958
46	Breton Bay Golf And Country Club Dam	St. Mary's	45	Earth	Irrigation	Significant	1970
47	York Building Products Pond No. 5	Cecil	44	Earth	Tailings	Low	1971
48	Lake Merle Dam	Frederick	44	Earth	Recreation	Significant	1971
49	Little Deer Creek Site 2a (mcknight/rutledge)	Harford	44	Earth	Flood Risk Reduction	Significant	1962
50	Lake Churchill (wynnfield Drive)	Montgomery	44	Earth	Recreation	Low	1971

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