Old browser warning

Site look funky?  Your browser is so old standards-based layouts and styling confuse it.  Consider updating.  One excellent option is Mozilla Firefox, versions of which are available for Linux, Mac and Windows.

Learn about stars here

State Summary

Level Legend: Running Below Minimum Recommended Flow Above Maximum Recommended Flow Unknown
Descriptions of reaches with River Name in bold have been verified by a regional StreamTeam member.

State River Name/Section Class Level Rel. Level Updated
MD Anacostia, Northwest Branch— US Rte 29 to Riggs Road I-III(V+) 16 cfs   low 12/5 1:30
MD Antietam Creek— 1) Upper: Oak Bridge to Hwy.68 I-II 2.45 feet   low 12/5 1:00
MD Antietam Creek— 2) Hwy.68 to Potomac River I-II 2.45 ft   low 12/5 1:00
MD Bear Creek— U.S. 219 to Youghiogheny River at Friendsville IV 65 cfs   low 12/5 1:30  
MD Beaver Creek— Beaver Creek Park N Ride (I-70) to Alternate Rt. 40 I(II) 2.45 ft   low 12/5 1:00
MD Bennett Creek— MD Route 355 to Monocacy River I-II 31 cfs   low 12/4 22:30
MD Big Elk Creek— PA Route 341 to Elkton I-II 40 cfs   low 12/5 1:45
MD Broad Creek— MD Route 136 to MD Route 623 I-II
MD Cabin John Creek— River Road to Potomac II-III 25 cfs   low 12/5 2:15
MD Casselman— MD Route 495 to Salisbury, Pennsylvania I-II 110 cfs   12/4 23:00
MD Casselman, N. Branch— Dung Hill Road to Maryland Route 485 I-III+ 1.51   low 12/4 23:00
MD Catoctin Creek— US 40 to Potomac River I-II 1.76 ft   low 12/5 1:30
MD Conowingo Creek— Oakwood to Susquehanna River IV-V
MD Crabtree Creek— Swanton, MD to Savage Reservoir III-IV+ 26 cfs   low 12/5 2:15
MD Deep Creek— Dam to Youghiogheny River V
MD Deer Creek— Bond Road to Susquehanna River I-III 2.18 ft   low 12/5 1:30
MD Evitts Creek— Lake Gordon Dam (PA) to Maryland Route 51(MD) I-III 2.05 feet   low 12/5 1:30
MD Fifteen Mile Creek— US Route 40 to Potomac River I-II(III) 0.86 ft   low 12/5 2:00
MD Flintstone Creek— Flintstone Creek Road to Town Creek I-III 22 cfs   low 12/5 1:30
MD Georges Creek— Maryland Rte. 36 (Midland) to N. Branch Potomac River III-IV 3.26 ft   low 12/5 1:30
MD Gunpowder Falls— 1 - Graves Run Rd to Prettyboy Reservoir (Gunpowder Road) II+ 8 cfs   low 12/5 1:15
MD Gunpowder Falls— 2 - Prettyboy Dam to Falls Road I-III 1.79 feet   low 12/5 2:15
MD Gunpowder Falls— 3 - Falls Road to Phoenix I-II 74 cfs   low 12/5 2:15
MD Gunpowder Falls— 4 - Lower Loch Raven Dam to Route 1 I
MD Gunpowder Falls— 5 - Route 1 to U.S.40 II-III
MD Gwynns Falls— Gwynn Oak Ave. to Wilkens Ave (US 1) II-III(IV) 18 cfs   low 12/5 1:30
MD Gwynns Falls— Villa Nova to Woodlawn II 18 cfs   low 12/5 1:30
MD Herring Run— Echodale Ave to US 40 II-III 1 cfs   low 12/5 1:48
MD Hunting Creek— Catoctin Hollow Road to Frank Bentz Lake III-IV+(V) 24 cfs   low 12/5 1:30
MD Jennings Run— Barrelville to Wills Creek III+ 30 cfs   low 12/5 0:30
MD Jones Falls— Lake Roland to Round Falls I-III
md Laurel Run— Laurel Run IV 2.75 feet   low 12/5 2:15
MD Little Falls— Parkton (Maryland Route 45) to Gunpowder Falls I-III 39 cfs   low 12/5 2:15
MD Little Gunpowder Falls— U.S. Route to U.S. Route 40 II-III 74 cfs   low 12/5 2:15
MD Little Patuxent— US Route 29 (Columbia) to US Route 1 I-IV 49 cfs   low 12/5 1:15
MD Little Seneca Creek— Boyds to Darnestown II(III) 64 cfs   low 12/5 1:30
MD Long Green Creek— Glen Arm Rd. to Gunpowder Falls IV 5.20   low 12/5 2:15
MD Middle creek— Wolfsville to Myersville II-III(V) 1.76 ft   low 12/5 1:30
MD Middle Patuxent— Carroll Mill Road to Savage Mill I-II(IV) 3.39 ft   low 12/5 1:15
MD Mill Run— Pigs Ear Road to Yough River Lake III-IV+
MD Muddy Creek— Cranesville Swamp Nature Preserve (Lake Ford Road) to Youghiogheny River I-III(V)
MD Northeast Creek— below covered bridge on Route 272 V
MD Octoraro Creek— New Bridge Road to Richardsmere II 1.91 ft   low 12/5 2:00
MD Olmstead Island Creek— Clarabarton Parkway to C&O Canal V
MD Owens Creek— 1) Lantz to Roddy Covered Bridge II-IV 24 cfs   low 12/5 1:30
MD Owens Creek— 2) Rocky Ridge Road (Hwy.77) to Monocacy River I-II 24 cfs   low 12/5 1:30
MD Patapsco— Woodstock to Elkridge I-III 31 cfs   low 12/5 1:15
MD Patapsco, S. Branch— Woodbine to Woodstock I-III(IV) 31 cfs   low 12/5 1:15
MD Piney Run— Arrington Road to Marriottsville I-III(IV) 9 cfs   low 12/5 1:15
MD Potomac— 1. Sandy Hook to Point of Rocks I-II 3.18 ft   med 12/5 2:15
MD Potomac— 2. Violette's Lock/GW Canal Loop I-II 3.06 Ft   med 12/5 1:45
MD Potomac— 4. Mather Gorge to Lock 10 I-IV 3.06 ft   med 12/5 1:45
MD Potomac— 5. Lock 10 to Little Falls I 3.06 feet   med 12/5 1:45
MD Potomac— 6. Little Falls II-III(IV) 3.06 ft   med 12/5 1:45
MD Potomac River— Great Falls (Center Lines) V+ 3.06 ft   low 12/5 1:45
MD Potomac River— Great Falls (MD Lines) V+ 3.06 ft   med 12/5 1:45
MD Potomac River— Great Falls (VA Lines) V+ 3.06 ft   med 12/5 1:45
MD Potomac, N. Branch— 1. Henry to Gormania I-III 2.75 ft   low 12/5 2:15
MD Potomac, N. Branch— 2. Gormania, WV to Kitzmiller, MD III-IV 2.75 ft   low 12/5 2:15
MD Potomac, N. Branch— 3. Kitzmiller, MD to Jennings Randolph Lake I-III 2.75 ft   low 12/5 2:15
MD Potomac, N. Branch— 4. Barnum, WV to Bloomington, MD II-III 108 cfs   low 12/5 2:15
MD Rock Creek— 1. Rockville to Military Road I(II) 25 cfs   low 12/5 2:15
MD Rock Creek— 2. Military Road to Potomac River in D.C. I-III 25 cfs   low 12/5 2:15
MD Savage— Avilton Lonaconing Road to Head of Savage Reservoir II(IV) 26 cfs   low 12/5 2:15
MD Savage— Dam to North Branch Potomac River III-IV 159 cfs   low 12/5 2:15  
MD Sideling Hill Creek— Purcell Penn.(sr 2011)to the Potomac river I-II 0.86 ft   low 12/5 2:00
MD Town Creek— I-68 to Potomac River I 22 cfs   low 12/5 1:30
MD Wills Creek— Ellerslie to Eckhart Junction I-II 30 cfs   low 12/5 0:30
MD Winters Run— Pleasantville Road to Maryland Route 7 I-II 24 cfs   low 12/5 1:00
MD Youghiogheny— 0. US Route 50 to Millers Run I-II
MD Youghiogheny— 1. Tippy-Top IV 373 cfs   med 12/5 2:15
MD Youghiogheny— 2. Top IV-V 373 cfs   med 12/5 2:15  
MD Youghiogheny— 3. Upper IV-V 2.98 ft   med 12/5 1:45