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USGS Daily Statistics for the Nation

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 06023000 Ruby River near Twin Bridges MT


Madison County, Montana
Hydrologic Unit Code 10020003
Latitude  45°30'24.89", Longitude 112°19'51.20" NAD83
Drainage area 970  square miles
Gage datum 4,670 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 1939-10-01 -> 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
1 159 140 140 176 170 280 340 112 174 207 222 205
2 156 141 139 174 169 289 332 111 172 204 220 205
3 153 151 138 182 168 308 331 109 173 199 220 207
4 152 156 139 183 171 334 332 106 175 198 220 202
5 153 149 140 185 167 346 324 107 175 197 218 195
6 152 148 140 189 161 361 311 104 177 196 221 194
7 153 148 144 191 165 379 295 103 180 197 221 191
8 153 146 146 193 180 400 284 101 181 194 225 189
9 152 142 148 192 190 415 270 100 183 195 219 189
10 150 141 149 193 193 414 258 102 185 197 220 187
11 150 141 150 186 196 407 248 107 185 198 218 185
12 151 141 152 188 195 401 244 108 188 199 218 184
13 148 142 151 190 198 404 237 110 185 201 217 181
14 145 142 152 191 196 407 235 113 186 201 217 181
15 143 142 153 188 191 407 228 116 186 205 216 183
16 140 142 154 183 187 429 219 117 186 205 216 182
17 138 144 159 188 183 459 203 119 187 205 219 183
18 138 142 164 189 185 465 194 119 187 205 222 182
19 137 143 164 189 183 461 187 118 189 207 222 182
20 137 143 164 189 186 444 176 125 189 209 219 184
21 138 142 164 188 198 438 164 130 193 207 220 184
22 139 141 168 189 211 423 150 135 194 209 218 181
23 139 141 170 191 220 391 146 144 194 212 218 179
24 138 138 175 193 225 371 139 148 195 213 217 174
25 138 139 180 192 235 372 133 151 193 215 215 173
26 137 137 183 194 245 374 126 152 194 216 212 172
27 135 137 181 191 244 371 124 157 194 216 209 169
28 137 138 182 185 241 357 124 162 197 217 207 168
29 139 148 182 185 245 342 118 166 203 216 206 166
30 141   183 181 259 325 116 168 202 214 204 166
31 139   183   270   113 170   213   163