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Streamflow Measurements for the Nation

! Streamflow measurement pages will be decommissioned in early 2026. Please find the modernized pages in WDFN that suit you best. Learn more about our modernization plans and timeline and new pages.

USGS 01490140 LITTLE BLACKWATER RIVER AT SEWARD, MD
Dorchester County, Maryland
Hydrologic Unit Code 02080110
Latitude  38°26'43", Longitude  76°05'02" NAD83
Drainage area 30.2  square miles
Gage datum 5.0 feet above NAVD88
Output formats
HTML table with channel data
HTML table without channel data
Tab-separated data with channel data
Tab-separated data without channel data
Graph of data
Reselect output format
Meas.
Number		   Date       Time Time
Datum		 Measurement
Used?		   Who Measuring
Agency		 Stream
flow
(ft3/s)		 Gage
Height
(ft)		 GH
Change
(ft)		 Meas.
Duration
(hr)		 Meas.
Rated		   Control Flow
Adjust.
Code 
1862010-09-21 13:36EDTYesAJT/CRLUSGS-254 Fair NONE
1852010-09-21 13:24EDTYesAJT/CRLUSGS-205 Fair NONE
1842010-09-21 13:12EDTYesAJT/CRLUSGS-150 Fair NONE
1832010-09-21 13:00EDTYesAJT/CRUSGS-127 Fair NONE
1822010-09-21 12:48EDTYesAJT/CRLUSGS-58.6 Fair NONE
1812010-09-21 12:36EDTYesAJT/CRLUSGS-37.0 Poor NONE
1802010-09-21 12:24EDTYesAJT/CRLUSGS-12.4 Poor NONE
1792010-09-21 12:12EDTYesAJT/CRLUSGS23.1 Poor NONE
1782010-09-21 12:00EDTYesAJT/CRLUSGS13.8 Poor NONE
1772010-09-21 11:48EDTYesAJT/CRLUSGS30.9 Poor NONE
1762010-09-21 11:24EDTYesAJT/CRLUSGS18.7 Poor NONE
1752010-09-21 11:12EDTYesAJT/CRLUSGS13.7 Poor NONE
1742010-09-21 11:00EDTYesAJT/CRLUSGS42.3 Fair NONE
1732010-09-21 10:48EDTYesAJT/CRLUSGS60.3 Fair NONE
1722010-09-21 10:36EDTYesAJT/CRLUSGS57.5 Fair NONE
1712010-09-21 10:24EDTYesAJT/CRLUSGS67.9 Fair NONE
1702010-09-21 10:21EDTYesAJT/CRLUSGS70.4 Fair NONE
1692010-09-21 10:00EDTYesAJT/CRLUSGS108 Fair NONE
1682010-09-21 09:48EDTYesAJT/CRLUSGS121 Fair NONE
1672010-09-21 09:36EDTYesAJT/CRLUSGS102 Fair NONE
1662010-09-21 09:24EDTYesAJT/CRLUSGS106 Fair NONE
1652010-09-21 09:12EDTYesAJT/CRLUSGS104 Fair NONE
1642010-09-21 09:00EDTYesAJT/CRLUSGS127 Fair NONE
1632010-09-21 08:48EDTYesAJT/CRLUSGS88.2 Fair NONE
1622010-09-21 08:36EDTYesAJT/CRLUSGS84.6 Fair NONE
1612010-09-21 08:24EDTYesAJT/CRLUSGS107 Fair NONE
1602010-04-14 12:42EDTYesAJT/CRLUSGS128 Fair NONE
1592010-04-14 12:36EDTYesAJT/CRLUSGS141 Fair NONE
1582010-04-14 12:30EDTYesAJT/CRLUSGS107 Fair NONE
1572010-04-14 12:24EDTYesAJT/CRLUSGS108 Fair NONE
1562010-04-14 12:18EDTYesAJT/CRLUSGS132 Fair NONE
1552010-04-14 12:12EDTYesAJT/CRLUSGS152 Fair NONE
1542010-04-14 12:06EDTYesAJT/CRLUSGS150 Fair NONE
1532010-04-14 12:00EDTYesAJT/CRLUSGS152 Fair NONE
1522010-04-14 11:54EDTYesAJT/CRLUSGS174 Fair NONE
1512010-04-14 11:48EDTYesAJT/CRLUSGS236 Fair NONE
1502010-04-14 11:42EDTYesAJT/CRLUSGS176 Fair NONE
1492010-04-14 11:36EDTYesAJT/CRLUSGS186 Fair NONE
1482010-04-14 11:30EDTYesAJT/CRLUSGS199 Fair NONE
1472010-04-14 11:24EDTYesAJT/CRLUSGS233 Fair NONE
1462010-04-14 11:18EDTYesAJT/CRLUSGS240 Fair NONE
1452010-04-14 11:12EDTYesAJT/CRLUSGS226 Fair NONE
1442010-04-14 11:06EDTYesAJT/CRLUSGS208 Fair NONE
1432010-04-14 11:00EDTYesAJT/CRLUSGS216 Fair NONE
1422010-04-14 10:54EDTYesAJT/CRLUSGS224 Fair NONE
1412010-04-14 10:48EDTYesAJT/CRLUSGS257 Fair NONE
1402010-04-14 10:42EDTYesAJT/CRLUSGS222 Fair NONE
1392010-04-14 10:37EDTYesAJT/CRLUSGS226 Fair NONE
1382010-04-14 10:30EDTYesAJT/CRLUSGS215 Fair NONE
1372010-04-14 10:24EDTYesAJT/CRLUSGS193 Fair NONE
1362009-10-14 12:59EDTYesAJT/CRLUSGS-3500.07 GoodUnspecifedNONE
1352009-10-14 12:47EDTYesAJT/CRLUSGS-3000.07 GoodUnspecifedNONE
1342009-10-14 12:35EDTYesAJTUSGS-2580.06 GoodUnspecifedNONE
1332009-10-14 12:23EDTYesAJT/CRLUSGS-2190.06 GoodUnspecifedNONE
1322009-10-14 12:11EDTYesAJT/CRLUSGS-1420.05 GoodUnspecifedNONE
1312009-10-14 11:59EDTYesAJT/CRLUSGS-80.50.05 GoodUnspecifedNONE
1302009-10-14 11:53EDTYesAJT/CRLUSGS-87.60.05 GoodUnspecifedNONE
1292009-10-14 11:47EDTYesAJT/CRLUSGS-56.40.04 GoodUnspecifedNONE
1282009-10-14 11:41EDTYesAJT/CRLUSGS-56.40.04 GoodUnspecifedNONE
1272009-10-14 11:35EDTYesAJT/CRLUSGS14.30.03 GoodUnspecifedNONE
1262009-10-14 11:29EDTYesAJT/CRLUSGS43.60.04 GoodUnspecifedNONE
1252009-10-14 11:23EDTYesAJT/CRLUSGS56.00.03 GoodUnspecifedNONE
1242009-10-14 11:17EDTYesAJT/CRLUSGS1070.03 GoodUnspecifedNONE
1232009-10-14 11:11EDTYesAJT/CRLUSGS1330.04 GoodUnspecifedNONE
1222009-10-14 11:05EDTYesAJT/CRLUSGS1490.02 GoodUnspecifedNONE
1212009-10-14 10:59EDTYesAJT/CRLUSGS1560.03 GoodUnspecifedNONE
1202009-08-13 14:41EDTYesAJT/CRLUSGS1540.41 GoodUnspecifedNONE
1192009-08-13 14:29EDTYesAJT/CRLUSGS1290.42 GoodUnspecifedNONE
1182009-08-13 14:17EDTYesAJT/CRLUSGS1070.42 GoodUnspecifedNONE
1172009-08-13 14:05EDTYesAJTUSGS78.10.43 GoodUnspecifedNONE
1162009-08-13 13:53EDTYesAJT/CRLUSGS52.20.43 GoodUnspecifedNONE
1152009-08-13 13:41EDTYesAJT/CRLUSGS-58.70.44 GoodUnspecifedNONE
1142009-08-13 13:29EDTYesAJT/CRLUSGS-75.50.44 GoodUnspecifedNONE
1132009-08-13 13:17EDTYesAJT/CRLUSGS-1310.44 GoodUnspecifedNONE
1122009-08-13 13:05EDTYesAJT/CRLUSGS-1660.44 GoodUnspecifedNONE
1112009-08-13 12:53EDTYesAJT/CRLUSGS-1610.44 GoodUnspecifedNONE
1102009-08-13 12:41EDTYesAJT/CRLUSGS-1580.43 GoodUnspecifedNONE
1092009-08-13 12:29EDTYesAJT/CRLUSGS-2120.44 GoodUnspecifedNONE
1082009-08-13 12:17EDTYesAJTUSGS-2580.44 GoodUnspecifedNONE
1072009-08-13 12:05EDTYesAJT/CRLUSGS-3170.43 GoodUnspecifedNONE
1062009-08-13 11:53EDTYesAJT/CRLUSGS-3630.43 GoodUnspecifedNONE
1052009-08-13 11:41EDTYesAJT/CRLUSGS-3620.43 GoodUnspecifedNONE
1042009-08-13 11:29EDTYesAJT/CRLUSGS-3430.43 GoodUnspecifedNONE
1032009-08-13 11:20EDTYesAJT/CRLUSGS-3630.42 GoodUnspecifedNONE
1022009-08-13 11:05EDTYesAJT/CRLUSGS-3420.42 GoodUnspecifedNONE
1012009-08-13 10:53EDTYesAJT/CRLUSGS-3230.41 GoodUnspecifedNONE
1002009-08-13 10:41EDTYesAJT/CRLUSGS-2750.41 GoodUnspecifedNONE
992009-08-13 10:29EDTYesAJT/CRLUSGS-1900.40 GoodUnspecifedNONE
982009-08-13 10:17EDTYesAJT/CRLUSGS-1750.40 GoodUnspecifedNONE
972009-08-13 10:03EDTYesAJT/CRLUSGS-1630.39 GoodUnspecifedNONE
962009-08-13 09:53EDTYesAJT/CRLUSGS-1690.39 GoodUnspecifedNONE
952009-08-13 09:42:30EDTYesAJT/CRLUSGS-1510.38 0.10GoodUnspecifedNONE
942008-06-10 17:42EDTYesAJTUSGS196 Fair NONE
932008-06-10 17:30EDTYesAJTUSGS169 Fair NONE
922008-06-10 17:18EDTYesAJTUSGS126 Fair NONE
912008-06-10 17:00EDTYesAJTUSGS179 Fair NONE
902008-06-10 16:48EDTYesAJTUSGS183 Fair NONE
892008-06-10 16:36EDTYesAJTUSGS126 Fair NONE
882008-06-10 16:27EDTYesAJTUSGS82.0 Fair NONE
872008-06-10 16:12EDTYesAJTUSGS133 Fair NONE
862008-06-10 15:59EDTYesAJTUSGS118 Fair NONE
852008-06-10 15:48EDTYesAJTUSGS131 Fair NONE
842008-06-10 15:36EDTYesAJTUSGS88.0 Fair NONE
832008-06-10 15:24EDTYesAJTUSGS-18.4 Fair NONE
822008-06-10 15:12EDTYesAJTUSGS-123 Fair NONE
812008-06-10 15:00EDTYesAJTUSGS-177 Fair NONE
802008-06-10 14:48EDTYesAJTUSGS-140 Fair NONE
792008-06-10 14:36EDTYesAJTUSGS-146 Fair NONE
782008-06-10 14:24EDTYesAJTUSGS-242 Fair NONE
772008-06-10 14:12EDTYesAJTUSGS-245 Fair NONE
722008-06-10 14:12EDTYesAJTUSGS-212 Fair NONE
762008-06-10 14:00EDTYesAJTUSGS-206 Fair NONE
752008-06-10 13:48EDTYesAJTUSGS-241 Fair NONE
742008-06-10 13:36EDTYesAJTUSGS-226 Fair NONE
732008-06-10 13:24EDTYesAJTUSGS-259 Fair NONE
712008-06-10 12:47EDTYesAJTUSGS-290 Fair NONE
702008-06-10 12:36EDTYesAJTUSGS-259 Fair NONE
692008-06-10 12:24EDTYesAJTUSGS-262 Fair NONE
682008-06-10 12:11EDTYesAJTUSGS-266 Fair NONE
672008-06-10 11:59EDTYesAJTUSGS-253 Fair NONE
662008-06-10 11:42EDTYesAJTUSGS-283 Fair NONE
652008-06-10 11:29EDTYesAJTUSGS-303 Fair NONE
642008-06-10 11:18EDTYesAJTUSGS-341 Fair NONE
632008-06-10 11:06EDTYesAJTUSGS-250 Fair NONE
622008-06-10 10:53EDTYesAJTUSGS-225 Fair NONE
612008-06-10 10:12EDTYesAJTUSGS-232 Fair NONE
602008-06-10 09:48EDTYesAJTUSGS-206 Fair NONE
592008-06-10 09:36EDTYesAJTUSGS-215 Fair NONE
582008-06-10 09:18EDTYesAJTUSGS-189 Fair NONE
572007-10-29 15:24EDTYesAJTUSGS1700.36 Fair NONE
562007-10-29 15:12EDTYesAJTUSGS1490.37 Fair NONE
552007-10-29 15:00EDTYesAJTUSGS91.90.37 Fair NONE
542007-10-29 14:48EDTYesAJTUSGS1220.36 Fair NONE
532007-10-29 14:36EDTYesAJTUSGS1550.37 Fair NONE
522007-10-29 14:24EDTYesAJTUSGS1650.37 Fair NONE
512007-10-29 14:12EDTYesAJTUSGS1570.38 Fair NONE
502007-10-29 14:00EDTYesAJTUSGS1560.38 Fair NONE
492007-10-29 13:48EDTYesAJTUSGS1890.39 Fair NONE
482007-10-29 13:36EDTYesAJTUSGS1920.39 Fair NONE
472007-10-29 13:24EDTYesAJTUSGS2350.39 Fair NONE
462007-10-29 13:12EDTYesAJTUSGS2110.39 Fair NONE
452007-10-29 13:00EDTYesAJTUSGS3090.40 Fair NONE
442007-10-29 12:48EDTYesAJTUSGS2850.41 Fair NONE
432007-10-29 12:12EDTYesAJTUSGS2910.41 Fair NONE
422007-10-29 12:00EDTYesAJTUSGS3220.42 Fair NONE
412007-10-29 11:48EDTYesAJTUSGS3790.42 Fair NONE
402007-10-29 11:36EDTYesAJTUSGS3070.42 Fair NONE
392007-10-29 11:24EDTYesAJTUSGS3290.43 Fair NONE
382007-10-29 11:12EDTYesAJTUSGS3410.43 Fair NONE
372007-10-29 11:00EDTYesAJTUSGS3370.44 Fair NONE
362007-10-29 10:48EDTYesAJTUSGS3840.45 Fair NONE
352007-10-29 10:36EDTYesAJTUSGS3530.45 Fair NONE
342007-10-29 10:24EDTYesAJTUSGS3780.45 Fair NONE
332007-10-29 10:12EDTYesAJTUSGS2930.45 Fair NONE
322007-10-29 10:00EDTYesAJTUSGS3140.45 Fair NONE
312007-03-22 15:50EDTYesAJTUSGS-24.3-0.42 Fair NONE
302007-03-22 15:40EDTYesAJTUSGS25.9-0.42 Fair NONE
292007-03-22 15:30EDTYesAJTUSGS33.2-0.41 Fair NONE
282007-03-22 15:20EDTYesAJTUSGS73.8-0.41 Fair NONE
272007-03-22 15:09EDTYesAJTUSGS44.7-0.42 Fair NONE
262007-03-22 14:59EDTYesAJTUSGS40.1-0.43 Fair NONE
252007-03-22 14:50EDTYesAJTUSGS41.5-0.43 Fair NONE
242007-03-22 14:39EDTYesAJTUSGS116-0.43 Fair NONE
232007-03-22 14:29EDTYesAJTUSGS144-0.43 Fair NONE
222007-03-22 14:19EDTYesAJTUSGS79.7-0.42 Fair NONE
212007-03-22 14:10EDTYesAJTUSGS12.4-0.43 Fair NONE
202007-03-22 13:59EDTYesAJTUSGS22.6-0.43 Fair NONE
192007-03-22 13:49EDTYesAJTUSGS-28.5-0.42 Fair NONE
182007-03-22 13:39EDTYesAJTUSGS-111-0.42 Fair NONE
172007-03-22 13:29EDTYesAJTUSGS-159-0.42 Fair NONE
162007-03-22 13:19EDTYesAJTUSGS-166-0.41 Fair NONE
152007-03-22 13:11EDTYesAJTUSGS-180-0.40 Fair NONE
142007-03-22 12:59EDTYesAJTUSGS-203-0.41 Fair NONE
132007-03-22 12:49EDTYesAJTUSGS-245-0.41 Fair NONE
122007-03-22 12:39EDTYesAJTUSGS-232-0.41 Fair NONE
112007-03-22 12:29EDTYesAJTUSGS-228-0.41 Fair NONE
102007-03-22 12:20EDTYesAJTUSGS-240-0.41 Fair NONE
92007-03-22 12:05EDTYesAJTUSGS-246-0.41 Fair NONE
82007-03-22 11:54EDTYesAJTUSGS-251-0.41 Fair NONE
72007-03-22 11:34EDTYesAJTUSGS-262-0.41 Fair NONE
62007-03-22 11:24EDTYesAJTUSGS-281-0.41 Fair NONE
52007-03-22 11:14EDTYesAJTUSGS-313-0.41 Fair NONE
42007-03-22 11:04EDTYesAJTUSGS-316-0.42 Fair NONE
32007-03-22 10:54EDTYesAJTUSGS-315-0.42 Fair NONE
22007-03-22 10:47EDTYesAJTUSGS-313-0.43 Fair NONE
12007-03-22 10:42EDTYesAJTUSGS-275-0.43 Fair NONE
4A2007-03-12 11:08EDTYesAJTUSGS-2121.51 Fair NONE
3A2007-03-12 11:01EDTYesAJTUSGS-2041.50 Fair NONE
2A2007-03-12 10:54EDTYesAJTUSGS-1761.50 Good NONE
1A2007-03-12 10:47EDTYesAJTUSGS-1891.49 Fair NONE
1Z2006-10-25 14:11EDTYesAJT/MBUSGS289 FairClearNONE