North Branch Bacterial Monitoring

Interstate Commission on the Potomac River Basin

The following bacteria data is being collected during the summer of 2025 at locations along the North Branch Potomac River. It is provided through a partnership between ICPRB and the Maryland Department of Environment. ICPRB will conduct bi-weekly monitoring through the end of the season.

Data

Map Name – Site Description Type Round 1 Round 2 Round 3 Round 4 Round 5 Round 6
Westernport – North Branch Potomac us stream of Westernport Mainstem 56 1986 1300 115 22 6
George’s Creek – Mouth of Georges Creek at Boat Launch Tributary 1300 >2419 >2419 2420 >2420 2420
McCoole – McCoole Boat Launch, North Branch Potomac Mainstem 71 60 104 43 84 15
Black Oak – Black Oak Boat Launch, North Branch Potomac Mainstem 82 51 116 80 89 14
Allegany Fairgrounds – Fairground’s Boat Launch, North Branch Potomac Mainstem 47 89 34 27 64 11
Gene Mason Complex – Gene Mason Recreation Complex Boat Launch (Above Cumberland WWTP) Mainstem 40 162 122 122 57 29
Locust Grove – Braddock Run at LaVale Pump Station on Old Mt. Savage Rd. Tributary >2419 649 1986 1046 411 1300
Braddock Run – Up stream of Locust Grove Sewage Pump Station on Will’s Creek Tributary 770 14 62 242 89 65
Will’s Creek Canal Place – Mouth of Will’s Creek at Foot Bridge (Canal Place) Tributary 387 16 56 24 204 152
Spring Gap – Down stream of Cumberland WWTP, Spring Gap Campground Mainstem 36 120 88 48 28 99
Porter – Porter Run above Preston Run along 40W * * * 82 69 *
Preston – Preston Run at Clarysville Bridge, Clary * * * 9 7 *
Savage – Savage River at Savage River Public Fishing Access * * * 9 9 11
Rye – Braddock Run at Rye St. * * * 1046 2420 579
Locust St. – Braddock Run at Locust St. * * * 345 >2420 1553
La Vale Plaza – Braddock Run at La Vale Plaza * * * 84 435 *
Red Hill – Braddock Run above CSO and Red Hill * * * 127 461 135
Braddock Run at Best Western * * * * * 118
Braddock Run at McDonald’s * * * * * >2420
Braddock Run at Comfort Inn * * * * * 1203
George’s Creek at Gilmore * * * * * 64
George’s Creek at Detmold * * * * * 46
George’s Creek at Franklin * * * * * 16
Braddock Run near Harbor * * * * * 2
Date tested 6/26/25 7/7/2025 7/21/2025 8/4/2025 8/18/2025 9/1/2025

Units: MPN/100mL
Field Method: EPA 1603.1, section 8
Lab Method: E.Coli Methods 9223 B 21st Edition – Colilert QT
*No data

Check out the U.S. EPA E. coli Factsheet for more information E. coli as a water quality parameter.

Map of Monitoring Sites

North Branch Potomac Bacterial Monitoring Sites, Summer 2025

Additional resources:

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