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USGS Daily Statistics for Maryland

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The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 01491000 CHOPTANK RIVER NEAR GREENSBORO, MD


Caroline County, Maryland
Hydrologic Unit Code 02060005
Latitude  38°59'49.9", Longitude  75°47'08.9" NAD83
Drainage area 113  square miles
Gage datum 2.73 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1947-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 201 163 238 249 171 137 62 57 54 87 85 123
2 233 173 245 271 161 141 58 67 52 76 112 118
3 207 203 272 271 162 121 58 62 50 67 127 120
4 184 211 271 250 150 108 60 155 67 61 102 121
5 168 230 255 222 152 109 56 168 57 57 88 130
6 167 223 236 225 158 106 60 126 46 53 91 139
7 166 211 279 226 164 99 61 93 46 50 96 140
8 171 209 273 255 162 137 57 82 45 46 108 193
9 181 193 268 251 153 119 60 79 48 49 104 184
10 209 178 251 225 143 102 73 66 53 58 91 190
11 196 191 232 229 139 107 83 58 66 63 81 166
12 185 212 236 215 141 111 76 60 91 81 94 171
13 190 208 255 212 156 105 109 81 105 80 127 165
14 193 219 305 247 138 110 125 116 66 64 125 200
15 190 224 318 245 122 89 100 90 57 57 119 215
16 178 246 261 291 116 76 79 69 93 51 115 210
17 170 232 246 279 124 113 74 61 121 53 113 216
18 170 217 253 210 127 138 64 58 69 52 108 198
19 192 233 253 177 133 150 57 56 66 58 93 198
20 207 252 269 165 140 144 53 60 63 70 89 168
21 213 219 264 161 139 142 55 61 54 69 96 169
22 210 221 314 154 122 131 59 67 48 60 99 203
23 189 250 297 148 120 131 57 90 51 53 107 186
24 201 312 292 148 120 106 55 73 64 54 99 174
25 223 321 294 160 115 86 58 78 69 65 109 211
26 249 320 253 163 145 86 64 118 67 79 128 216
27 238 276 252 164 159 94 59 100 75 92 119 216
28 238 236 269 175 122 80 58 189 78 89 109 172
29 270 175 298 194 114 71 56 159 68 98 111 170
30 206   289 179 147 61 69 93 74 162 120 173
31 167   266   145   57 61   122   186