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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
1 201 163 238 251 172 136 63 56 54 87 85 123
2 233 173 245 273 162 141 58 66 52 76 112 118
3 207 203 272 273 163 121 57 62 50 67 127 120
4 184 211 271 251 151 108 59 157 67 61 102 121
5 168 230 255 224 153 110 56 169 57 57 88 130
6 167 223 236 227 159 107 60 126 46 53 91 139
7 166 211 279 227 165 100 61 93 46 50 96 140
8 171 209 273 254 163 137 56 82 45 46 108 193
9 181 193 268 251 155 119 58 79 48 49 104 184
10 209 178 251 225 144 102 72 66 53 58 91 190
11 196 191 232 230 140 108 81 58 66 63 81 166
12 185 212 236 207 142 112 72 60 91 81 94 171
13 190 208 255 203 157 105 108 81 105 80 127 165
14 193 219 305 244 139 111 125 116 66 64 125 200
15 190 224 318 245 122 89 100 90 57 57 119 215
16 178 246 261 291 117 76 78 69 93 51 115 210
17 170 232 246 280 124 114 72 61 121 53 113 216
18 170 217 254 211 128 139 63 58 69 52 108 198
19 192 233 255 178 134 151 57 56 66 58 93 198
20 207 252 271 165 141 146 52 60 63 70 89 168
21 213 219 266 162 141 143 54 61 54 69 96 169
22 210 221 317 154 122 132 58 67 48 60 99 203
23 189 250 300 149 120 132 57 90 51 53 107 186
24 201 312 295 149 120 107 55 73 64 54 99 174
25 223 321 296 161 116 87 58 78 69 65 109 211
26 249 320 255 164 146 87 64 118 67 79 128 216
27 238 276 254 165 160 95 59 100 75 92 119 216
28 238 236 272 176 123 80 58 189 78 89 109 172
29 270 175 301 195 114 71 56 159 68 98 111 170
30 206   292 180 146 62 69 93 74 162 120 173
31 167   268   145   57 61   122   186