Color Mode
Level Legend Low Running High Unknown
River Name/Section Class Level   Updated
Anacostia, Northwest Branch [MD] US Rte 29 to Riggs Road I-III(V+) 36 cfs
-1 cfs/hr
L5-
Below Recom.

00h44m
Antietam Creek [MD] 1) Upper: Oak Ridge Dr. to Hwy.68 (Devils Backbone Park) I-II 4.48 ft
-0.01 ft/hr
R4-
Runnable

01h14m
Antietam Creek [MD] 2) Hwy 68 to Hwy 34 I-II 4.48 ft
-0.01 ft/hr
R5-
Runnable

01h14m
Antietam Creek [MD] 3) Hwy.34 to Potomac River I-II 4.48 ft
-0.01 ft/hr
R5-
Runnable

01h14m
Bear Creek [MD] U.S. 219 to Youghiogheny River at Friendsville IV 179 cfs
-4 cfs/hr
L6-
Below Recom.

00h59m
Beaver Creek [MD] Beaver Creek Park N Ride (I-70) to Alternate Rt. 40 I(II) 4.48 ft
-0.01 ft/hr
R4-
Runnable

01h14m
Bennett Creek [MD] MD Route 355 to Monocacy River I-II 184 cfs
-7 cfs/hr
R2-
Lower Runnable

00h44m
Big Elk Creek [MD] PA Route 341 to Elkton I-II 633 cfs
-111 cfs/hr
R0-
Lower Runnable

00h44m
Broad Creek [MD] MD Route 136 to MD Route 623 I-II 271 cfs
-4 cfs/hr
L0-
Below Recom.

01h14m
Cabin John Creek [MD] River Road to Potomac II-III 84 cfs
-3 cfs/hr
L8-
Below Recom.

01h14m
Casselman, N. Branch [MD] Dung Hill Road to Maryland Route 495 I-III 1.97 ft
-0.01 ft/hr
L0-
Below Recom.

00h59m
Casselman [MD] 1) MD Route 495 to Salisbury, Pennsylvania I-II 258 cfs
-4 cfs/hr
R3-
Runnable

00h59m
Catoctin Creek [MD] US 40 to Potomac River I-II 2.62 ft
-0.02 ft/hr
R3-
Runnable

00h44m
Conococheague Creek [MD] Wilson Bridge (US 40) to Williamsport, MD Boat Ramp I 7.09 ft
-0.06 ft/hr
R7-
Upper Runnable

00h44m
Conowingo Creek [MD] Oakwood to Susquehanna River IV-V n/a

Crabtree Creek [MD] Swanton, MD to Savage Reservoir III-IV+ 261 cfs
-4 cfs/hr
L6-
Below Recom.

01h14m
Deep Creek [MD] Dam to Youghiogheny River V n/a

Deer Creek [MD] 1. Bond Road to MD 23 I 2.97 ft
-0.01 ft/hr
L9-
Below Recom.

01h14m
Deer Creek [MD] 2. Harford Creamery Rd. to Eden Mill Park boat ramp I 2.97 ft
-0.01 ft/hr
R4-
Runnable

01h14m
Deer Creek [MD] 3. Eden Mill Dam to Rocks State Park I-II(III) 2.97 ft
-0.01 ft/hr
R4-
Runnable

01h14m
Deer Creek [MD] 4. Rocks State Park to US 1, Benjamin Bridge Access I-II(III) 2.97 ft
-0.01 ft/hr
R4-
Runnable

01h14m
Deer Creek [MD] 5. US Rt 1, Benjamin Bridge Access to MD 136 I-II 2.97 ft
-0.01 ft/hr
R4-
Runnable

01h14m
Deer Creek [MD] 6. MD 136 to Susquehanna River I-II 2.97 ft
-0.01 ft/hr
R4-
Runnable

01h14m
Evitts Creek [MD] 1. Lake Gordon Dam (PA) to Maryland Route 144 (MD) I-III 5.78 ft
-0.11 ft/hr
R3-
Runnable

00h59m
Evitts Creek [MD] 2. MD 144 to MD 51 I-II 5.78 ft
-0.11 ft/hr
R3-
Runnable

00h59m
Fifteen Mile Creek [MD] US Route 40 to Potomac River I-II(III) 3.24 ft
0.00 ft/hr
R4-
Runnable

00h29m
Flintstone Creek [MD] Flintstone Creek Road to Town Creek I-III 1060 cfs
-50 cfs/hr
R4-
Runnable

00h59m
Georges Creek [MD] Maryland Rte. 36 (Midland) to N. Branch Potomac River III-IV 5.00 ft
-0.06 ft/hr
R4-
Runnable

00h44m
Gunpowder Falls [MD] 1 - Graves Run Rd to Prettyboy Reservoir (Gunpowder Road) II+ 26 cfs
0 cfs/hr
L6-
Below Recom.

00h59m
Gunpowder Falls [MD] 2 - Prettyboy Dam to Falls Road I-III 211 cfs
-5 cfs/hr
R4-
Runnable

00h29m
Gunpowder Falls [MD] 3 - Masemore Road to Monkton Road I-II 318 cfs
-3 cfs/hr
R4-
Runnable

00h31m
Gunpowder Falls [MD] 4. Monkton Road to Phoenix I 425 cfs
-3 cfs/hr
R4-
Runnable

01h14m
Gunpowder Falls [MD] 5 - Lower Loch Raven Dam to Route 1 I-II ~ 603 cfs
0 cfs/hr
R4-
Runnable

00h27m
Gunpowder Falls [MD] 6 - Route 1 to U.S.40 II-III ~ 613 cfs
0 cfs/hr
R4-
Runnable

00h27m
Gwynns Falls [MD] 1) Villa Nova to Woodlawn II 48 cfs
0 cfs/hr
L6-
Below Recom.

00h59m
Gwynns Falls [MD] 2) Gwynn Oak Ave. to Wilkens Ave (US 1) II-III(IV) 48 cfs
0 cfs/hr
L6-
Below Recom.

00h59m
Herring Run [MD] Echodale Ave to US 40 II-III 1 cfs
0 cfs/hr
L9-
Below Recom.

00h25m
Hunting Creek [MD] Catoctin Hollow Road to Frank Bentz Lake III-IV+(V) 249 cfs
-8 cfs/hr
L8-
Below Recom.

00h44m
Jennings Run [MD] Barrelville to Wills Creek III+ 1050 cfs
-30 cfs/hr
R1-
Lower Runnable

01h14m
Jones Falls [MD] Lake Roland to Round Falls I-III n/a

Laurel Run [MD] Laurel Run IV 4.48 ft
-0.04 ft/hr
L3-
Below Recom.

01h14m
Little Falls of the Gunpowder [MD] Parkton (Maryland Route 45) to Gunpowder Falls I-III 132 cfs
0 cfs/hr
L7-
Below Recom.

01h14m
Little Gunpowder Falls [MD] 1) Bottom Rd @ Laurel Brook to Jerusalem Mill (Jerusalem Rd.... I-II 110 cfs
-1 cfs/hr
L8-
Below Recom.

01h14m
Little Gunpowder Falls [MD] 2) Jerusalem Mill (Jerusalem Rd.) to U.S. Route 40 II-III 110 cfs
-1 cfs/hr
L8-
Below Recom.

01h14m
Little Patuxent [MD] US Route 29 (Columbia) to US Route 1 I-IV 192 cfs
-9 cfs/hr
L0-
Below Recom.

01h14m
Little Seneca Creek [MD] Boyds to Darnestown II(III) 262 cfs
0 cfs/hr
L0-
Below Recom.

00h40m
Long Green Creek [MD] Glen Arm Rd. to Gunpowder Falls IV 21 cfs
0 cfs/hr
L0-
Below Recom.

01h14m
Middle Creek (Catoctin Creek trib.) [MD] Wolfsville to Myersville II-III(V) 2.62 ft
-0.02 ft/hr
L4-
Below Recom.

00h44m
Middle Creek (Toms Creek trib.) [MD] T318 to Harney Road II+ 1390 cfs
-141 cfs/hr
R3-
Runnable

00h59m
Middle Patuxent [MD] Carroll Mill Road to Savage Mill I-II(IV) 4.12 ft
-0.04 ft/hr
L0-
Below Recom.

01h14m
Mill Run [MD] Pigs Ear Road to Yough River Lake III-IV+ 54 cfs
-2 cfs/hr
L1-
Below Recom.

01h14m
Monocacy River [MD] 1. Creagerstown Park to Devilbiss Bridge Park I 11.43 ft
+0.02 ft/hr
H9-
Above Recom.

01h58m
Monocacy River [MD] 2. Devilbiss Bridge Park to Riverbend Park I 11.43 ft
+0.02 ft/hr
H9-
Above Recom.

01h58m
Monocacy River [MD] 3. Pinecliff Park to Buckeystown Park I(II) 11.43 ft
+0.02 ft/hr
H9-
Above Recom.

01h58m
Monocacy River [MD] 4. Buckeystown Park to Park Mills Road I(II) 11.43 ft
+0.02 ft/hr
H9-
Above Recom.

01h58m
Muddy Creek [MD] Cranesville Swamp Nature Preserve (Lake Ford Road) to Youghi... I-III(V) 54 cfs
-2 cfs/hr
L4-
Below Recom.

01h14m
Northeast Creek [MD] below covered bridge on Route 272 V 633 cfs
-111 cfs/hr
R0-
Lower Runnable

00h44m
Octoraro Creek [MD] New Bridge Road to Richardsmere II 417 cfs
-17 cfs/hr
R3-
Runnable

00h44m
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 249 cfs
-8 cfs/hr
L8-
Below Recom.

00h44m
Owens Creek [MD] 2) Rocky Ridge Road (Hwy.77) to Monocacy River I-II 249 cfs
-8 cfs/hr
L9-
Below Recom.

00h44m
Patapsco, S. Branch [MD] 1. Woodbine to Henryton Rd. II+(III) ~ 184 cfs
-4 cfs/hr
L0-
Below Recom.

00h46m
Patapsco, S. Branch [MD] 2. Marriottsville Rd to Patapsco, N. Branch confluence I-III(IV) 378 cfs
-4 cfs/hr
R4-
Runnable

01h16m
Patapsco [MD] 1. N. Br./S. Br. confluence to Daniels river access I 474 cfs
-7 cfs/hr
R4-
Runnable

01h16m
Patapsco [MD] 2. Daniels river access (below Dam) to Elkridge I-III 566 cfs
-7 cfs/hr
R1-
Lower Runnable

01h14m
Piney Run [MD] Arrington Road to Marriottsville I-III(IV) 28 cfs
0 cfs/hr
L3-
Below Recom.

01h29m
Potomac, North Branch [MD] 1. Henry, WV to Gormania, WV I-III 4.48 ft
-0.04 ft/hr
L6-
Below Recom.

01h14m
Potomac, North Branch [MD] 2. Gormania, WV to Kitzmiller, MD III-IV 4.48 ft
-0.04 ft/hr
R4-
Runnable

01h14m
Potomac, North Branch [MD] 3. Kitzmiller, MD to Jennings Randolph Lake II-III 4.48 ft
-0.04 ft/hr
R4-
Runnable

01h14m
Potomac, North Branch [MD] 4. Barnum, WV to Bloomington, MD II(III) 445 cfs
-5 cfs/hr
R0-
Lower Runnable

01h14m
Potomac, North Branch [MD] 5. Bloomington, MD to Keyser, WV I-II 1020 cfs
0 cfs/hr
R4-
Runnable

00h29m
Potomac, North Branch [MD] 6. Black Oak River Access Nr. McCoole, MD to Pinto, MD I 1020 cfs
0 cfs/hr
R4-
Runnable

00h29m
Potomac, North Branch [MD] 7. Pinto, MD to Upper Potomac Industrial Park (upstream of C... I 1020 cfs
0 cfs/hr
R4-
Runnable

00h29m
Potomac, North Branch [MD] 8. Wiley's Ford, WV to Oldtown Toll Bridge I 2925 cfs
+ 10 cfs/hr
R8-
Upper Runnable

00h31m
Potomac [MD] 0.1 Oldtown Toll Bridge to Paw Paw Tunnel Campground I 13.53 ft
-0.05 ft/hr
H9-
Above Recom.

01h14m
Potomac [MD] 0.2 Paw Paw Tunnel Campground to Fifteen Mile Creek Boat Lan... I 13.53 ft
-0.05 ft/hr
H9-
Above Recom.

01h14m
Potomac [MD] 0.3 Fifteen Mile Creek Boat Ramp to Hancock, MD I 10.31 ft
+0.33 ft/hr
H9-
Above Recom.

01h14m
Potomac [MD] 0.4 Big Pool Campground to Williamsport MD I 10.31 ft
+0.33 ft/hr
H9-
Above Recom.

01h14m
Potomac [MD] 0.5 Dam # 4 to Shepherdstown WV I 10.31 ft
+0.33 ft/hr
H9-
Above Recom.

01h14m
Potomac [MD] 0.6 Shepherdstown, WV to Dargans Bend Boat Ramp I 10.31 ft
+0.33 ft/hr
H9-
Above Recom.

01h14m
Potomac [MD] 0.7 - Harpers Ferry - Dargans Bend Boat Ramp to Sandy Hook/P... II+ 10.31 ft
+0.33 ft/hr
H9-
Above Recom.

01h14m
Potomac [MD] 0.8 Sandy Hook/Potoma Wayside to Point of Rocks MD I-II 8.05 ft
+0.15 ft/hr
H3-
Above Recom.

02h03m
Potomac [MD] 0.9 Point of Rocks to Mouth of Monocacy I 5.73 ft
+0.02 ft/hr
R5-
Runnable

00h44m
Potomac [MD] 1. Mouth of Monocacy to Riley's Lock Boat Ramp I 5.73 ft
+0.02 ft/hr
R5-
Runnable

00h44m
Potomac [MD] 2. Violette's Lock to Pennyfield Lock I-II 5.73 ft
+0.02 ft/hr
R5-
Runnable

00h44m
Potomac [MD] 3. Great Falls (Center Lines) V+ 5.73 ft
+0.02 ft/hr
H9-
Above Recom.

00h44m
Potomac [MD] 3. Great Falls (Fish Ladder) IV-V(V+) 5.73 ft
+0.02 ft/hr
H5-
Above Recom.

00h44m
Potomac [MD] 3. Great Falls (MD Lines) V+ 5.73 ft
+0.02 ft/hr
H2-
Above Recom.

00h44m
Potomac [MD] 3. Great Falls (VA Lines) V 5.73 ft
+0.02 ft/hr
H9-
Above Recom.

00h44m
Potomac [MD] 3. Through Great Falls (several runs) V+ 5.73 ft
+0.02 ft/hr
H9-
Above Recom.

00h44m
Potomac [MD] 4. Sandy Beach/O-Deck to Anglers Inn II-III(IV) 5.73 ft
+0.02 ft/hr
H7-
Above Recom.

00h44m
Potomac [MD] 5. Anglers Inn to Lock 10 II 5.73 ft
+0.02 ft/hr
R8-
Upper Runnable

00h44m
Potomac [MD] 6. Lock 10 to Sycamore Island I 5.73 ft
+0.02 ft/hr
R8-
Upper Runnable

00h44m
Potomac [MD] 7. Little Falls II-III(IV) 5.73 ft
+0.02 ft/hr
H9-
Above Recom.

00h44m
Rock Creek [MD] 1. Rockville to Beach Dr. Near DC/MD line. I(II) 84 cfs
-3 cfs/hr
L0-
Below Recom.

01h14m
Rock Creek [MD] 2. Beach Dr. below East-West Hwy to Potomac River in D.C. I-III 84 cfs
-3 cfs/hr
L0-
Below Recom.

01h14m
Savage [MD] 1. Avilton Lonaconing Road to Head of Savage Reservoir II(IV) 261 cfs
-4 cfs/hr
L5-
Below Recom.

01h14m
Savage [MD] 2. Savage Dam to North Branch Potomac River III-IV 371 cfs
0 cfs/hr
L7-
Below Recom.

01h14m
Seneca Creek [MD] Black Rock Mill to Riley's Lock Boat Ramp I-II 262 cfs
0 cfs/hr
R4-
Runnable

00h40m
Sideling Hill Creek [MD] Purcell Penn.(sr 2011)to the Potomac river I-II 3.24 ft
0.00 ft/hr
R4-
Runnable

00h29m
Town Creek [MD] 1. Chaneysville to I-68 (Maryland) I-II 5.78 ft
-0.11 ft/hr
R2-
Lower Runnable

00h59m
Town Creek [MD] 2. I-68 to Potomac River I 1060 cfs
-50 cfs/hr
R5-
Runnable

00h59m
Wills Creek [MD] Ellerslie to Eckhart Junction I-II 1050 cfs
-30 cfs/hr
R5-
Runnable

01h14m
Winters Run [MD] Pleasantville Road to Maryland Route 7 I-II 98 cfs
0 cfs/hr
L0-
Below Recom.

01h14m
Youghiogheny [MD] 0. US Route 50 to Millers Run I-II 54 cfs
-2 cfs/hr
L7-
Below Recom.

01h14m
Youghiogheny [MD] 1. Tippy-Top IV 654 cfs
-17 cfs/hr
R5-
Runnable

01h14m
Youghiogheny [MD] 2. Top IV-V 654 cfs
-17 cfs/hr
R5-
Runnable

01h14m
Youghiogheny [MD] 3. Upper IV-V 3.77 ft
-0.03 ft/hr
R7-
Upper Runnable

00h44m