Water Supply Dams in Maryland

Maryland has 42 water supply dams, of which 27 carry a high hazard classification. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area.

#	Dam	County	Height (ft)	Hazard	Condition	Year
1	Liberty Dam	Baltimore	175	High	Unsatisfactory	1953
2	Prettyboy Dam	Baltimore	155	High	Fair	1936
3	T. Howard Duckett Dam	Howard	139	High	Fair	1953
4	Loch Raven Dam	Baltimore	130	High	Satisfactory	1923
5	Druid Hill Lake Reservoir And Storage Tanks	Baltimore City	118	High	Poor	1871
6	Little Seneca Dam	Montgomery	99	High	Fair	1984
7	Rocky Gap Dam	Allegany	98	High	Poor	1969
8	Hunting Creek Dam	Frederick	79	High	Fair	1969
9	Piney Run Dam	Carroll	73	High	Unsatisfactory	1974
10	Warner Gap Hollow Dam	Washington	65	High	Unsatisfactory	1902
11	Mt. Soma Reservoir	Harford	61	High	Satisfactory	2018
12	Little Youghiogheny Site 6 (broadford)	Garrett	60	High	Fair	1971
13	Atkisson Reservoir	Harford	59	High	Unsatisfactory	1942
14	Fishing Creek Dam	Frederick	58	High	Unsatisfactory	1925
15	Frostburg Reservoir	Garrett	46	High	Poor	1990
16	Industrial Dam (blue Bridge)	Allegany	40	Low		1954
17	Towson Reservoir Storage Tanks	Baltimore	40	High	Satisfactory	2013
18	Lake Ashburton Reservoir And Storage Tanks	Baltimore City	40	High	Not Rated	1910
19	Hillen Road Water Supply Tank	Baltimore City	36	High	Satisfactory	1920
20	Guilford Reservoir Storage Tanks	Baltimore City	35	High	Satisfactory	1893
21	Cranberry Branch Dam	Carroll	32	Significant	Fair	1957
22	Emmitsburg Dam	Frederick	30	High	Fair	1950
23	Hampstead Industrial Center Dam	Carroll	28	Low	Not Rated	1956
24	Lake Placid Dam (edison Park Drive)	Montgomery	26	Significant	Satisfactory	1963
25	Camp Fretterd Miltary Reservation Dam	Baltimore	24	Low	Unsatisfactory	1967
26	Pikesville Reservoir Storage Tanks	Baltimore	22	High	Satisfactory	2007
27	Koontz Run Reservoir Tanks	Allegany	21	High	Satisfactory	2015
28	Lonaconing Reservoir	Allegany	20	High	Poor	1895
29	Mays Chapel Reservoir	Baltimore	20	High	Satisfactory	1965
30	Midland-gilmore Reservoir	Allegany	19	High	Poor	1903
31	Lower Lake Royer	Washington	19	High	Fair	1898
32	Soil Conservation Service Lake (soil Conservation Road)	Prince George's	17	Low	Fair	1939
33	Smithsburg Reservoir	Washington	16	Significant	Fair	1881
34	Fullerton Reservoir Tanks	Baltimore	15	High	Satisfactory	2020
35	Perryville Water Supply	Cecil	15	Significant	Poor	1900
36	Little Falls Dam - Potomac River	Montgomery	12	Low		1958
37	Upper Lake Royer	Washington	12	Low	Fair	1898
38	Ppg Rubble Dam	Allegany	11	Undetermined		1950
39	Hagerstown Municipal Pwr Plant Dam	Washington	10	Low	Fair	1950
40	Powellville Dam	Wicomico	9	Low	Fair	1940
41	Piedmont Water Supply Intake Dam	Garrett	8	Low	Not Rated	1911
42	Newpage Westvaco Dam	Allegany	7	Low	Fair	1913

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