Dams in Pennsylvania

%!s(int=1480)Total Dams

780High Hazard

308Significant

379Low Hazard

Dam Safety in Pennsylvania

Pennsylvania has 1,480 dams tracked in the National Inventory of Dams. Of these, 780 (52%) are classified as high hazard — meaning failure would probably cause loss of human life — and 308 are classified as significant hazard. Currently, 215 dams in the state have a condition assessment of poor or unsatisfactory, indicating recognized safety deficiencies.

The average dam in Pennsylvania is 80 years old. As dams age, inspection frequency and maintenance become increasingly important for ensuring public safety. The most common purpose for dams in Pennsylvania is recreation, accounting for 808 of the state's dams.

Use the search above to find dams near any address in Pennsylvania, or browse by county below. Each dam listing includes its hazard potential classification, condition assessment, physical characteristics, and inspection history from the NID.

Pennsylvania Dam Facts

Total Dams	1,480
High Hazard Dams	780
Average Dam Age	80 years
Tallest Dam	410 ft
Largest Reservoir	1,300,000 acre-ft
Poor/Unsatisfactory Condition	215

Notable Dams in Pennsylvania

Harmar Refuse Bank410 ftHigh Little Blue Run400 ftHigh Cumberland No. 1 Slurry Pond 1380 ftHigh Cumberland No. 2 Slurry Pond370 ftHigh Bailey Mine Area No. 3 Slurry337 ftHigh

Counties in Pennsylvania

Adams14 dams6 high hazard Allegheny44 dams16 high hazard Armstrong14 dams4 high hazard Beaver16 dams5 high hazard Bedford12 dams5 high hazard Berks31 dams23 high hazard Blair18 dams15 high hazard Bradford32 dams11 high hazard Bucks32 dams14 high hazard Butler40 dams21 high hazard Cambria23 dams13 high hazard Cameron2 dams2 high hazard Carbon16 dams14 high hazard Centre13 dams10 high hazard Chester43 dams17 high hazard Clarion2 dams1 high hazard Clearfield19 dams10 high hazard Clinton5 dams4 high hazard Columbia11 dams6 high hazard Crawford24 dams8 high hazard Cumberland11 dams4 high hazard Dauphin9 dams3 high hazard Delaware9 dams5 high hazard Elk7 dams5 high hazard Erie14 dams7 high hazard Fayette29 dams14 high hazard Forest2 dams1 high hazard Franklin9 dams2 high hazard Fulton4 dams3 high hazard Greene50 dams25 high hazard Huntingdon10 dams4 high hazard Indiana15 dams9 high hazard Jefferson12 dams7 high hazard Juniata1 dams1 high hazard Lackawanna50 dams32 high hazard Lancaster18 dams9 high hazard Lawrence2 dams Lebanon13 dams5 high hazard Lehigh9 dams3 high hazard Luzerne56 dams35 high hazard Lycoming12 dams7 high hazard McKean7 dams4 high hazard Mercer18 dams11 high hazard Mifflin3 dams2 high hazard Monroe79 dams44 high hazard Montgomery28 dams13 high hazard Montour2 dams2 high hazard Northampton13 dams3 high hazard Northumberland4 dams2 high hazard Perry8 dams3 high hazard Philadelphia7 dams3 high hazard Pike81 dams45 high hazard Potter5 dams2 high hazard Schuylkill54 dams43 high hazard Snyder6 dams6 high hazard Somerset32 dams18 high hazard Sullivan15 dams5 high hazard Susquehanna73 dams25 high hazard Tioga20 dams14 high hazard Union4 dams1 high hazard Venango5 dams2 high hazard Warren3 dams3 high hazard Washington67 dams39 high hazard Wayne98 dams49 high hazard Westmoreland52 dams31 high hazard Wyoming14 dams10 high hazard York29 dams14 high hazard

High Hazard Dams in Pennsylvania

Dam	County	Height	Condition	Purpose
Harmar Refuse Bank	Allegheny	410 ft	Satisfactory	Other
Little Blue Run	Beaver	400 ft	Fair	Other
Cumberland No. 1 Slurry Pond 1	Greene	380 ft	Satisfactory	Other
Cumberland No. 2 Slurry Pond	Greene	370 ft	Satisfactory	Other
Bailey Mine Area No. 3 Slurry	Greene	337 ft	Satisfactory	Other
Bailey No. 8 Slurry Impoundment	Greene	317 ft	Not Rated	Other
Bailey Mine Slurry Impoundment	Greene	315 ft	Satisfactory	Other
Emerald No. 1 Main Valley Eastern	Greene	310 ft	Satisfactory	Other
Mathies Mine Refuse Area Pond #2	Washington	300 ft	Fair	Other
Emerald No. 2 Main Valley Eastern	Greene	270 ft	Satisfactory	Other
Hughes Hollow Slurry Impoundment	Greene	245 ft	Satisfactory	Other
Labelle Slurry Pond #3	Fayette	245 ft	Satisfactory	Other
Cornwall Tailings	Lebanon	200 ft	Fair	Tailings
Weisner Hollow Slurry	Jefferson	192 ft	Fair	Other
Mine No 84 - Pond 6 Main	Washington	185 ft	Satisfactory	Other
Youghiogheny Dam	Fayette	184 ft	Not Available	Flood Risk Reduction
East Branch Dam	Elk	184 ft	Not Available	Flood Risk Reduction
Cambria Slurry Pond #4	Cambria	178 ft	Fair	Other
Beltzville Dam	Carbon	177 ft	Not Available	Flood Risk Reduction
Kinzua Dam	Warren	177 ft	Not Available	Flood Risk Reduction
George B Stevenson	Cameron	166 ft	Satisfactory	Flood Risk Reduction
Alvin R. Bush Dam	Clinton	165 ft	Not Available	Flood Risk Reduction
Bailey Mine Fresh Water Imp	Greene	164 ft	Satisfactory	Grade Stabilization
Mahoning Creek Dam	Armstrong	162 ft	Not Available	Flood Risk Reduction
Tionesta Dam	Forest	154 ft	Not Available	Flood Risk Reduction
Penn Forest	Carbon	151 ft	Satisfactory	Water Supply
Cowanesque Dam	Tioga	151 ft	Not Available	Flood Risk Reduction
Horne No 5 Slurry	Washington	146 ft	Satisfactory	Other
Grace Mine Tailings	Berks	145 ft	Fair	Recreation
Conemaugh Dam	Westmoreland	144 ft	Not Available	Flood Risk Reduction
Crooked Creek Dam	Armstrong	143 ft	Not Available	Flood Risk Reduction
Prompton Dam	Wayne	140 ft	Not Available	Flood Risk Reduction
Ash Basin No 2	Snyder	136 ft	Fair	Other
Wild Creek	Carbon	135 ft	Fair	Water Supply
Watres	Lackawanna	135 ft	Satisfactory	Water Supply
Laurel Creek	Mifflin	135 ft	Fair	Water Supply
Kinzua Upper Reservoir Dike	Warren	135 ft	Satisfactory	Hydroelectric
Curwensville Dam	Clearfield	131 ft	Not Available	Flood Risk Reduction
Piney	Clarion	129 ft	Fair	Hydroelectric
Christian E Siegrist	Schuylkill	125 ft	Satisfactory	Water Supply
Hammond Dam	Tioga	122 ft	Not Available	Flood Risk Reduction
Maple Creek Slurry Pond 1	Washington	120 ft	Satisfactory	Other
Fawn Mine #91 Refuse Impoundment	Butler	120 ft	Fair	Other
Loyalhanna Dam	Westmoreland	120 ft	Not Available	Flood Risk Reduction
Ash Basin No 3	Snyder	117 ft	Fair	Other
Saltlick	Cambria	116 ft	Satisfactory	Water Supply
Maple Creek #3 Slurry Pond #1	Washington	115 ft	Satisfactory	Other
Little Pine Creek	Lycoming	113 ft	Poor	Flood Risk Reduction
Nockamixon	Bucks	112 ft	Fair	Recreation
Long Pine Run	Adams	112 ft	Fair	Water Supply
General Edgar Jadwin Dam	Wayne	110 ft	Not Available	Flood Risk Reduction
Lake Marburg	York	107 ft	Satisfactory	Other
North Fork	Somerset	105 ft	Poor	Water Supply
Dehart	Dauphin	105 ft	Poor	Water Supply
Trout Run	Berks	104 ft	Fair	Water Supply
Nesbitt	Lackawanna	101 ft	Satisfactory	Water Supply
John C Youngman	Lycoming	101 ft	Fair	Water Supply
Quemahoning	Somerset	100 ft	Satisfactory	Water Supply
Mill Run	Blair	100 ft	Poor	Water Supply
Reading Anthracite Co - New St. Nicholas Breaker	Schuylkill	100 ft	Not Available	Water Supply
Keystone Station	Armstrong	100 ft	Satisfactory	Grade Stabilization
Blue Marsh Dam	Berks	100 ft	Not Available	Flood Risk Reduction
Locust Creek (pa-423)	Schuylkill	98 ft	Fair	Flood Risk Reduction
Goose Pond Run (pa-464)	Monroe	97 ft	Fair	Flood Risk Reduction
J C Bacon	Beaver	96 ft	Fair	Water Supply
Robinson Fork (pa-647)	Washington	95 ft	Satisfactory	Flood Risk Reduction
Indian Run	Schuylkill	94 ft	Satisfactory	Water Supply
Beaver Run	Westmoreland	92 ft	Satisfactory	Water Supply
Thomas W Koon	Bedford	92 ft	Satisfactory	Water Supply
Lake Wynonah	Schuylkill	92 ft	Fair	Recreation
Maple Creek Slurry Pond No 2 - A	Washington	91 ft	Satisfactory	Other
Two Lick Creek	Indiana	90 ft	Satisfactory	Grade Stabilization
Emerald No. 1 Back Valley Western	Greene	90 ft	Satisfactory	Other
Emerald No. 2 Back Valley Western	Greene	90 ft	Satisfactory	Other
Marsh Creek Reservoir (pa-437)	Chester	90 ft	Fair	Recreation
Leavitt Branch (pa-463)	Monroe	90 ft	Poor	Flood Risk Reduction
Woodcock Creek Dam	Crawford	90 ft	Not Available	Flood Risk Reduction
Sludge Bed No 6	Butler	88 ft	Fair	Other
Union City Dam	Erie	88 ft	Not Available	Flood Risk Reduction
Green Lane Reservoir	Montgomery	87 ft	Satisfactory	Water Supply
Little Schuylkill River (pa-422)	Schuylkill	87 ft	Satisfactory	Flood Risk Reduction
Still Creek	Schuylkill	86 ft	Satisfactory	Water Supply
H A Stewart	Westmoreland	86 ft	Fair	Water Supply
Pa-486	Washington	86 ft	Satisfactory	Flood Risk Reduction
Lake Pahagaco	York	85 ft	Fair	Recreation
Two Mile Run	Venango	85 ft	Fair	Flood Risk Reduction
Hinckston	Cambria	84 ft	Poor	Water Supply
Lake Gordon	Bedford	84 ft	Fair	Water Supply
Laurel Run Reservoir	Elk	84 ft	Poor	Water Supply
Bear Gap No 2	Columbia	83 ft	Fair	Water Supply
Maple Creek #3 Slurry Pond #2	Washington	83 ft	Satisfactory	Other
York Indian Rock Dam	York	83 ft	Not Available	Flood Risk Reduction
Lake Rene	Clearfield	82 ft	Fair	Recreation
Cross Creek (pa-661)	Washington	82 ft	Satisfactory	Flood Risk Reduction
Ashland Reservoir	Schuylkill	80 ft	Poor	Water Supply
Mill Service No 6	Westmoreland	80 ft	Satisfactory	Other
Pa-485	Washington	78 ft	Satisfactory	Flood Risk Reduction
Stillwater Dam	Susquehanna	77 ft	Not Available	Flood Risk Reduction
Hamilton Lake (pa-602)	Tioga	76 ft	Fair	Flood Risk Reduction
Taylor Pond (pa-446)	Pike	76 ft	Fair	Flood Risk Reduction