Color Mode
Level Legend Low Running High Unknown
River Name/Section Class Level   Updated
Anacostia, Northwest Branch [MD] US Rte 29 (Burnt Mills) to Riggs Road (Adelphi Mill) I-IV(V+) 33 cfs
-1 cfs/hr
L5-
Below Recom.

00h32m
Antietam Creek [MD] 1) Upper: Oak Ridge Dr. to Hwy.68 (Devils Backbone Park) I-II 2.69 ft
+0.02 ft/hr
L0-
Below Recom.

01h01m
Antietam Creek [MD] 2) Hwy 68 to Hwy 34 I-II 2.69 ft
+0.02 ft/hr
R2-
Lower Runnable

01h01m
Antietam Creek [MD] 3) Hwy.34 to Potomac River I-II 2.69 ft
+0.02 ft/hr
R2-
Lower Runnable

01h01m
Bear Creek [MD] U.S. 219 to Youghiogheny River at Friendsville IV 11 cfs
-0 cfs/hr
L0-
Below Recom.

00h46m
Beaver Creek [MD] Beaver Creek Park N Ride (I-70) to Alternate Rt. 40 I(II) 2.69 ft
+0.02 ft/hr
L0-
Below Recom.

01h01m
Bennett Creek [MD] MD Route 355 to Monocacy River I-II 59 cfs
-2 cfs/hr
L0-
Below Recom.

00h32m
Big Elk Creek [MD] PA Route 341 to Elkton I-II 198 cfs
-19 cfs/hr
R0-
Lower Runnable

00h32m
Broad Creek [MD] MD Route 136 to MD Route 623 I-II 209 cfs
-14 cfs/hr
L0-
Below Recom.

01h01m
Cabin John Creek [MD] River Road to Potomac II-III 180 cfs
-11 cfs/hr
L8-
Below Recom.

01h01m
Casselman, N. Branch [MD] Dung Hill Road to Maryland Route 495 I-III 8 cfs
0 cfs/hr
L0-
Below Recom.

00h46m
Casselman [MD] 1) MD Route 495 to Salisbury, Pennsylvania I-II 8 cfs
0 cfs/hr
L0-
Below Recom.

00h46m
Catoctin Creek [MD] US 40 to Potomac River I-II 1.84 ft
-0.01 ft/hr
L0-
Below Recom.

00h32m
Conococheague Creek [MD] Wilson Bridge (US 40) to Williamsport, MD Boat Ramp I 2.35 ft
-0.02 ft/hr
R3-
Runnable

00h32m
Conowingo Creek [MD] Oakwood to Susquehanna River IV-V n/a

Crabtree Creek [MD] Swanton, MD to Savage Reservoir III-IV+ 6 cfs
0 cfs/hr
L2-
Below Recom.

01h01m
Deep Creek [MD] Dam to Youghiogheny River V n/a

Deer Creek [MD] 1. Bond Road to MD 23 I 2.76 ft
-0.04 ft/hr
L4-
Below Recom.

01h01m
Deer Creek [MD] 2. Harford Creamery Rd. to Eden Mill Park boat ramp I 2.76 ft
-0.04 ft/hr
R2-
Lower Runnable

01h01m
Deer Creek [MD] 3. Eden Mill Dam to Rocks State Park I-II(III) 2.76 ft
-0.04 ft/hr
R4-
Runnable

01h01m
Deer Creek [MD] 4. Rocks State Park to Sandy Hook Rd./Deer Creek Conservatio... I-II(III) 2.76 ft
-0.04 ft/hr
R3-
Runnable

01h01m
Deer Creek [MD] 5. Sandy Hook Rd./Deer Creek Cons. area to MD 136 I-II 2.76 ft
-0.04 ft/hr
R3-
Runnable

01h01m
Deer Creek [MD] 6. MD 136 to Susquehanna River I-II 2.76 ft
-0.04 ft/hr
R3-
Runnable

01h01m
Evitts Creek [MD] 1. Lake Gordon Dam (PA) to Maryland Route 144 (MD) I-III 2.11 ft
0.00 ft/hr
L0-
Below Recom.

00h46m
Evitts Creek [MD] 2. MD 144 to MD 51 I-II 2.11 ft
0.00 ft/hr
L0-
Below Recom.

00h46m
Fifteen Mile Creek [MD] US Route 40 to Potomac River I-II(III) 0.63 ft
0.00 ft/hr
L0-
Below Recom.

00h17m
Flintstone Creek [MD] Flintstone Creek Road to Town Creek I-III 27 cfs
0 cfs/hr
L0-
Below Recom.

00h46m
Georges Creek [MD] Maryland Rte. 36 (Midland) to N. Branch Potomac River III-IV 3.04 ft
+0.01 ft/hr
L0-
Below Recom.

00h32m
Gunpowder Falls [MD] 1 - Graves Run Rd to Prettyboy Reservoir (Gunpowder Road) II+ 12 cfs
-0 cfs/hr
L2-
Below Recom.

01h01m
Gunpowder Falls [MD] 2 - Prettyboy Dam to Falls Road I-III 141 cfs
+ 3 cfs/hr
R4-
Runnable

00h17m
Gunpowder Falls [MD] 3 - Masemore Road to Blue Mount Road I-II 141 cfs
+ 3 cfs/hr
R4-
Runnable

00h17m
Gunpowder Falls [MD] 4. Blue Mount Road to Phoenix I 263 cfs
-4 cfs/hr
R4-
Runnable

00h57m
Gunpowder Falls [MD] 5 - Lower Loch Raven Dam to Route 1 I-II ~ 376 cfs
0 cfs/hr
R3-
Runnable

00h19m
Gunpowder Falls [MD] 6 - Route 1 to U.S.40 II-III ~ 381 cfs
0 cfs/hr
R3-
Runnable

00h19m
Gwynns Falls [MD] 1) Villa Nova to Woodlawn II 60 cfs
-4 cfs/hr
L6-
Below Recom.

00h46m
Gwynns Falls [MD] 2) Gwynn Oak Ave. to Wilkens Ave (US 1) II-III(IV) 60 cfs
-4 cfs/hr
L6-
Below Recom.

00h46m
Herring Run [MD] Echodale Ave to US 40 II-III 1 cfs
0 cfs/hr
L9-
Below Recom.

00h12m
Hunting Creek [MD] Catoctin Hollow Road to Frank Bentz Lake III-IV+(V) 32 cfs
-1 cfs/hr
L7-
Below Recom.

00h32m
Jennings Run [MD] Barrelville to Wills Creek III+ 13 cfs
0 cfs/hr
L6-
Below Recom.

01h01m
Jones Falls [MD] Lake Roland to Round Falls I-III n/a

Laurel Run [MD] Laurel Run IV 2.30 ft
0.00 ft/hr
L0-
Below Recom.

01h01m
Little Falls of the Gunpowder [MD] Parkton (Maryland Route 45) to Gunpowder Falls I-III 79 cfs
-4 cfs/hr
L4-
Below Recom.

01h01m
Little Gunpowder Falls [MD] 1) Bottom Rd @ Laurel Brook to Jerusalem Mill (Jerusalem Rd.... I-II 61 cfs
-2 cfs/hr
L8-
Below Recom.

01h01m
Little Gunpowder Falls [MD] 2) Jerusalem Mill (Jerusalem Rd.) to U.S. Route 40 II-III 61 cfs
-2 cfs/hr
L0-
Below Recom.

01h01m
Little Seneca Creek [MD] Boyds to Darnestown II(III) 219 cfs
-21 cfs/hr
L0-
Below Recom.

00h27m
Long Green Creek [MD] Glen Arm Rd. to Gunpowder Falls IV 12 cfs
-1 cfs/hr
L0-
Below Recom.

01h01m
Middle Creek (Catoctin Creek trib.) [MD] Wolfsville to Myersville II-III(V) 1.84 ft
-0.01 ft/hr
L0-
Below Recom.

00h32m
Middle Creek (Toms Creek trib.) [MD] T318 to Harney Road II+ 219 cfs
-5 cfs/hr
L2-
Below Recom.

00h46m
Mill Run [MD] Pigs Ear Road to Yough River Lake III-IV+ 2 cfs
0 cfs/hr
L0-
Below Recom.

01h01m
Monocacy River [MD] 1. Creagerstown Park to Devilbiss Bridge Park I 2.58 ft
+0.02 ft/hr
R4-
Runnable

01h46m
Monocacy River [MD] 2. Devilbiss Bridge Park to Riverbend Park I 2.58 ft
+0.02 ft/hr
R4-
Runnable

01h46m
Monocacy River [MD] 3. Pinecliff Park to Buckeystown Park I(II) 2.58 ft
+0.02 ft/hr
R4-
Runnable

01h46m
Monocacy River [MD] 4. Buckeystown Park to Park Mills Road I(II) 2.58 ft
+0.02 ft/hr
R4-
Runnable

01h46m
Muddy Creek [MD] Cranesville Swamp Nature Preserve (Lake Ford Road) to Youghi... I-III(V) 2 cfs
0 cfs/hr
L0-
Below Recom.

01h01m
Northeast Creek [MD] below covered bridge on Route 272 V 198 cfs
-19 cfs/hr
L9-
Below Recom.

00h32m
Octoraro Creek [MD] 3. New Bridge Road to Richardsmere II 452 cfs
-216 cfs/hr
R4-
Runnable

00h32m
Olmsted Island Creek [MD] Clara Barton Parkway to C&O Canal V n/a

Owens Creek [MD] 1) Lantz to Roddy Covered Bridge II-IV 32 cfs
-1 cfs/hr
L7-
Below Recom.

00h32m
Owens Creek [MD] 2) Rocky Ridge Road (Hwy.77) to Monocacy River I-II 32 cfs
-1 cfs/hr
L0-
Below Recom.

00h32m
Patapsco, S. Branch [MD] 1. Woodbine to Henryton Rd. II+(III) ~ 96 cfs
-1 cfs/hr
L0-
Below Recom.

00h23m
Patapsco, S. Branch [MD] 2. Marriottsville Rd to Patapsco, N. Branch confluence I-III(IV) 160 cfs
-12 cfs/hr
L0-
Below Recom.

01h01m
Patapsco [MD] 1. N. Br./S. Br. confluence to Daniels river access I 160 cfs
-12 cfs/hr
L0-
Below Recom.

01h01m
Patapsco [MD] 2. Daniels river access (below Dam) to Elkridge I-III ~ 160 cfs
-12 cfs/hr
L0-
Below Recom.

01h01m
Patuxent, Little [MD] US Route 29 (Columbia) to US Route 1 I-IV 247 cfs
-17 cfs/hr
L8-
Below Recom.

01h01m
Patuxent, Middle [MD] Carroll Mill Road to Savage Mill I-II(IV) 4.35 ft
-0.07 ft/hr
L3-
Below Recom.

01h01m
Piney Run [MD] Arrington Road to Marriottsville I-III(IV) 12 cfs
0 cfs/hr
L0-
Below Recom.

01h16m
Potomac, North Branch [MD] 1. Henry, WV to Gormania, WV I-III 2.30 ft
0.00 ft/hr
L0-
Below Recom.

01h01m
Potomac, North Branch [MD] 2. Gormania, WV to Kitzmiller, MD III-IV 2.30 ft
0.00 ft/hr
L0-
Below Recom.

01h01m
Potomac, North Branch [MD] 3. Kitzmiller, MD to Jennings Randolph Lake II-III 2.30 ft
0.00 ft/hr
L0-
Below Recom.

01h01m
Potomac, North Branch [MD] 4. Barnum, WV to Bloomington, MD II(III) 252 cfs
0 cfs/hr
L2-
Below Recom.

01h01m
Potomac, North Branch [MD] 5. Bloomington, MD to Keyser, WV I-II 344 cfs
0 cfs/hr
L6-
Below Recom.

00h17m
Potomac, North Branch [MD] 6. Black Oak River Access Nr. McCoole, MD to Pinto, MD I 344 cfs
0 cfs/hr
R3-
Runnable

00h17m
Potomac, North Branch [MD] 7. Pinto, MD to Upper Potomac Industrial Park (upstream of C... I 344 cfs
0 cfs/hr
R3-
Runnable

00h17m
Potomac, North Branch [MD] 8. Wiley's Ford, WV to Oldtown Toll Bridge I 344 cfs
0 cfs/hr
R3-
Runnable

00h17m
Potomac [MD] 0.1 Oldtown Toll Bridge to Paw Paw Tunnel Campground I 4.31 ft
-0.01 ft/hr
R4-
Runnable

01h01m
Potomac [MD] 0.2 Paw Paw Tunnel Campground to Fifteen Mile Creek Boat Lan... I 4.31 ft
-0.01 ft/hr
R4-
Runnable

01h01m
Potomac [MD] 0.3 Fifteen Mile Creek Boat Ramp to Hancock, MD I 3.76 ft
-0.02 ft/hr
R4-
Runnable

01h01m
Potomac [MD] 0.4 Big Pool/Fort Frederick Campground to Williamsport MD I 3.76 ft
-0.02 ft/hr
R4-
Runnable

01h01m
Potomac [MD] 0.5 Dam # 4 to Shepherdstown WV I 3.76 ft
-0.02 ft/hr
R4-
Runnable

01h01m
Potomac [MD] 0.6 Shepherdstown, WV to Dargans Bend Boat Ramp I 3.76 ft
-0.02 ft/hr
R4-
Runnable

01h01m
Potomac [MD] 0.7 - Potomac - Dargans Bend Boat Ramp to Potoma Wayside II+ 3.76 ft
-0.02 ft/hr
R4-
Runnable

01h01m
Potomac [MD] 0.8 Sandy Hook/Potoma Wayside to Point of Rocks MD I-II 3.76 ft
-0.02 ft/hr
R4-
Runnable

01h01m
Potomac [MD] 0.9 Point of Rocks to Mouth of Monocacy I 3.63 ft
-0.02 ft/hr
R4-
Runnable

00h32m
Potomac [MD] 1. Mouth of Monocacy to Riley's Lock Boat Ramp I 3.63 ft
-0.02 ft/hr
R4-
Runnable

00h32m
Potomac [MD] 2. GW Canal Loop or Violette's Lock to Pennyfield Lock I-II 3.63 ft
-0.02 ft/hr
R4-
Runnable

00h32m
Potomac [MD] 3. Great Falls (Center Lines) V+ 3.63 ft
-0.02 ft/hr
R4-
Runnable

00h32m
Potomac [MD] 3. Great Falls (Fish Ladder) V 3.63 ft
-0.02 ft/hr
R1-
Lower Runnable

00h32m
Potomac [MD] 3. Great Falls (MD Lines) V+ 3.63 ft
-0.02 ft/hr
H1-
Above Recom.

00h32m
Potomac [MD] 3. Great Falls (VA Lines) V+ 3.63 ft
-0.02 ft/hr
R7-
Upper Runnable

00h32m
Potomac [MD] 3. Through Great Falls (several runs) V+ 3.63 ft
-0.02 ft/hr
R7-
Upper Runnable

00h32m
Potomac [MD] 4. Sandy Beach/O-Deck to Anglers Inn II-III(IV) 3.63 ft
-0.02 ft/hr
R5-
Runnable

00h32m
Potomac [MD] 5. Anglers Inn to Lock 10 II 3.63 ft
-0.02 ft/hr
R5-
Runnable

00h32m
Potomac [MD] 6. Lock 10 to Sycamore Island I 3.63 ft
-0.02 ft/hr
R5-
Runnable

00h32m
Potomac [MD] 7. Little Falls II-III(IV) 3.63 ft
-0.02 ft/hr
R5-
Runnable

00h32m
Rock Creek [MD] 1. Rockville to Beach Dr. Near DC/MD line. I(II) 180 cfs
-11 cfs/hr
R0-
Lower Runnable

01h01m
Rock Creek [MD] 2. Beach Dr. below East-West Hwy to Potomac River in D.C. I-III 180 cfs
-11 cfs/hr
L8-
Below Recom.

01h01m
Savage [MD] 1. Avilton Lonaconing Road to Head of Savage Reservoir II(IV) 6 cfs
0 cfs/hr
L0-
Below Recom.

01h01m
Savage [MD] 2. Savage Dam to North Branch Potomac River III-IV 59 cfs
0 cfs/hr
L0-
Below Recom.

01h01m
Seneca Creek [MD] Black Rock Mill to Riley's Lock Boat Ramp I-II 219 cfs
-21 cfs/hr
R3-
Runnable

00h27m
Sideling Hill Creek [MD] Purcell Penn.(sr 2011)to the Potomac river I-II 0.63 ft
0.00 ft/hr
L0-
Below Recom.

00h17m
Town Creek [MD] 1. Chaneysville to I-68 (Maryland) I-II 2.11 ft
0.00 ft/hr
L8-
Below Recom.

00h46m
Town Creek [MD] 2. I-68 to Potomac River I 27 cfs
0 cfs/hr
L0-
Below Recom.

00h46m
Wills Creek [MD] Ellerslie to Eckhart Junction I-II 13 cfs
0 cfs/hr
L0-
Below Recom.

01h01m
Winters Run [MD] Pleasantville Road to Maryland Route 7 I-II 70 cfs
-3 cfs/hr
L0-
Below Recom.

01h01m
Youghiogheny [MD] 0. US Route 50 to Millers Run I-II 2 cfs
0 cfs/hr
L0-
Below Recom.

01h01m
Youghiogheny [MD] 1. Tippy-Top IV 38 cfs
0 cfs/hr
L7-
Below Recom.

01h01m
Youghiogheny [MD] 2. Top IV-V 38 cfs
0 cfs/hr
L7-
Below Recom.

01h01m
Youghiogheny [MD] 3. Upper IV-V 2.33 ft
0.00 ft/hr
L0-
Below Recom.

00h32m