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USGS Surface-Water Daily Statistics for Arizona

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Welcome to the NWIS-Web for the Arizona Water Science Center


The majority of USGS Gaging Stations are funded though a cooperative program between the USGS other interested agencies.
Follow this link for information on the Cooperative Water Program with the USGS.

Arizona Water Science Center Home Page
Colorado Basin River Forecast Center (CBRFC) - provided by the National Weather Service, AHPS. CBRFC on an interactive map.
Threatened and Endangered USGS Gaging Stations in Arizona

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 09527660 BROCK RESERVOIR OUTLET NEAR CALEXICO, CA


Imperial County, California
Hydrologic Unit Code 18100204
Latitude  32°42'20.71", Longitude 115°02'03.59" NAD83
Gage datum 97.94 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 2013-10-01 -> 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 10 115 188 166 156 242 171 63 279 129 115 155
2 92 176 150 138 220 170 145 90 245 110 195 245
3 137 167 174 217 219 208 141 213 93 143 93 219
4 161 137 171 236 157 255 98 306 100 154 154 144
5 164 217 51 109 163 135 74 258 50 98 221 142
6 175 194 112 54 56 76 152 232 178 104 298 143
7 208 137 278 191 81 75 179 224 204 151 229 128
8 262 213 273 164 155 117 273 240 216 130 219 148
9 262 161 168 340 132 115 237 235 141 131 81 189
10 368 306 230 374 207 67 274 418 219 111 161 155
11 278 343 128 333 287 98 198 272 154 132 153 59
12 96 268 146 266 313 86 92 168 230 78 79 82
13 242 206 152 381 174 65 107 227 226 212 141 107
14 351 138 74 328 153 192 149 265 296 230 180 241
15 338 255 72 184 118 157 99 309 196 182 234 247
16 246 266 46 135 161 140 137 372 133 162 198 312
17 103 253 92 163 182 32 114 228 349 198 160 244
18 117 213 157 249 197 58 151 78 269 196 91 229
19 58 78 184 199 191 132 118 84 230 174 126 103
20 176 39 157 149 308 131 83 103 134 128 203 149
21 210 87 249 82 272 211 108 33 114 66 293 256
22 100 106 336 137 66 382 115 25 158 194 212 213
23 102 185 275 240 1.7 460 82 132 172 121 207 242
24 119 229 222 306 39 306 115 208 158 47 189 45
25 122 122 262 282 139 140 146 332 138 57 166 8.3
26 134 276 245 301 312 32 129 210 118 78 127 245
27 147 127 184 133 279 102 207 105 84 123 142 354
28 78 114 177 39 268 274 354 117 94 201 260 426
29 78 86 96 41 175 274 193 125 95 207 220 292
30 76   143 130 109 207 157 128 194 217 338 101
31 139   227   273   130 169   243   19