Largest Reservoirs in Pennsylvania

Pennsylvania has 1456 dams with recorded storage capacity. The largest is Kinzua Dam with 1,300,000 acre-feet of maximum storage. One acre-foot equals about 326,000 gallons — enough to supply roughly two households for a year.

#	Dam	County	Max Storage (acre-ft)	Height (ft)	Purpose	Year
1	Kinzua Dam	Warren	1,300,000	177	Flood Risk Reduction	1965
2	Raystown Dam - Hesston Dike	Huntingdon	871,000	15	Flood Risk Reduction	1973
3	Pymatuning	Crawford	445,000	50	Flood Risk Reduction	1933
4	Conemaugh Dam	Westmoreland	355,000	144	Flood Risk Reduction	1952
5	Shenango Dam	Mercer	351,000	68	Flood Risk Reduction	1965
6	Youghiogheny Dam	Fayette	300,000	184	Flood Risk Reduction	1944
7	Tafton Dike	Pike	270,000	40	Hydroelectric	1926
8	Curwensville Dam	Clearfield	209,000	131	Flood Risk Reduction	1965
9	Tionesta Dam	Forest	180,000	154	Flood Risk Reduction	1940
10	Francis E. Walter Dam - Saddle Dike	Luzerne	160,290	30	Flood Risk Reduction	1961
11	Safe Harbor	Lancaster	144,000	75	Hydroelectric	1930
12	Hammond Dam	Tioga	136,936	122	Flood Risk Reduction	1978
13	Crooked Creek Dam	Armstrong	132,000	143	Flood Risk Reduction	1940
14	Blue Marsh Dam - Dikes A And B	Berks	129,900	25	Flood Risk Reduction	1977
15	Blue Marsh Dam - Bernville Levee	Berks	129,900	30	Flood Risk Reduction	1977
16	Blue Marsh Dam	Berks	129,900	100	Flood Risk Reduction	1977
17	Loyalhanna Dam	Westmoreland	127,556	120	Flood Risk Reduction	1942
18	George B Stevenson	Cameron	127,000	166	Flood Risk Reduction	1956
19	Alvin R. Bush Dam	Clinton	117,000	165	Flood Risk Reduction	1962
20	Beltzville Dam	Carbon	103,625	177	Flood Risk Reduction	1969
21	East Branch Dam	Elk	103,000	184	Flood Risk Reduction	1952
22	Moraine State Park	Butler	98,000	55	Recreation	1968
23	Mahoning Creek Dam	Armstrong	94,000	162	Flood Risk Reduction	1941
24	Union City Dam	Erie	94,000	88	Flood Risk Reduction	1971
25	Cowanesque Dam	Tioga	84,747	151	Flood Risk Reduction	1980
26	Beaver Run	Westmoreland	74,000	92	Water Supply	1952
27	Little Blue Run	Beaver	73,000	400	Other	1977
28	Prompton Dam	Wayne	72,800	140	Flood Risk Reduction	1961
29	Nockamixon	Bucks	71,000	112	Recreation	1973
30	Glendale	Cambria	68,000	60	Flood Risk Reduction	1960
31	Lake Wilhelm (pa-475)	Mercer	66,400	50	Flood Risk Reduction	1969
32	Muddy Run East Dike	Lancaster	60,500	12	Hydroelectric	1967
33	Montgomery Locks And Dam	Beaver	57,500	62	Navigation	1936
34	Quemahoning	Somerset	57,400	100	Water Supply	1912
35	Lake Marburg	York	53,100	107	Other	1967
36	York Indian Rock Dam	York	48,000	83	Flood Risk Reduction	1942
37	General Edgar Jadwin Dam	Wayne	47,300	110	Flood Risk Reduction	1960
38	Keystone Station	Armstrong	43,150	100	Grade Stabilization	1965
39	Emsworth Locks And Dams	Allegheny	42,700	25	Navigation	1938
40	Adam T. Bower Memorial	Northumberland	38,200	8	Recreation	1969
41	Yellow Creek	Indiana	37,800	62	Recreation	1969
42	Little Pine Creek	Lycoming	35,500	113	Flood Risk Reduction	1950
43	Woodcock Creek Dam	Crawford	31,540	90	Flood Risk Reduction	1973
44	Maxwell Locks And Dam	Washington	30,900	56	Navigation	1964
45	Dehart	Dauphin	30,800	105	Water Supply	1940
46	Penn Forest	Carbon	27,600	151	Water Supply	1998
47	Piney	Clarion	26,600	129	Hydroelectric	1924
48	Shohola Marsh	Pike	26,450	34	Recreation	1968
49	Shawnee Lake	Bedford	25,250	56	Flood Risk Reduction	1950
50	Green Lane Reservoir	Montgomery	25,114	87	Water Supply	1957

← All dams in Pennsylvania · Largest reservoirs nationwide