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USGS Daily Statistics for Iowa

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Boating safety tips are available from the U.S. Coast Guard.

NOTE: Station Numbers for Iowa precipitation gages have changed (see list).


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 05470500 Ioway Creek at Ames, IA


Story County, Iowa
Hydrologic Unit Code 07080105
Latitude  42°01'21.2", Longitude  93°37'49.8" NAD83
Drainage area 204  square miles
Gage datum 880.48 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 1919-10-01 -> 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 62 62 128 217 247 239 346 72 82 127 94 74
2 60 67 132 190 226 219 241 81 87 116 90 71
3 61 55 143 186 236 228 230 77 69 98 80 68
4 56 57 163 188 228 244 246 73 60 118 75 65
5 54 60 144 177 220 234 256 69 70 99 72 66
6 51 51 143 180 203 237 208 72 73 82 75 71
7 49 47 157 168 247 227 183 74 62 76 83 64
8 47 57 159 169 235 269 204 86 88 86 75 61
9 45 69 178 205 265 284 372 148 96 118 72 58
10 42 79 196 192 243 253 256 201 80 108 95 55
11 42 59 219 193 221 267 273 317 84 121 92 54
12 38 52 267 226 250 367 216 198 76 137 90 59
13 35 54 299 233 299 366 198 114 78 103 83 70
14 36 72 338 235 269 428 174 83 84 90 79 107
15 34 98 252 245 227 495 123 96 73 95 76 110
16 37 90 243 252 235 392 135 159 77 86 77 72
17 60 102 236 237 245 529 237 104 88 75 91 64
18 70 127 273 240 254 426 217 80 84 85 87 59
19 59 194 321 227 295 412 161 87 115 86 88 55
20 52 176 286 229 261 326 130 105 127 75 89 54
21 46 165 228 236 270 315 122 97 118 74 90 55
22 41 144 201 241 273 326 111 88 92 86 83 56
23 38 135 220 236 263 331 107 96 90 96 82 56
24 37 125 229 209 308 326 102 75 83 92 78 57
25 35 109 216 247 353 326 103 64 102 80 75 71
26 34 95 205 278 345 312 86 85 103 75 71 67
27 33 144 184 261 360 408 87 79 118 70 72 69
28 33 126 177 231 335 334 86 77 100 67 78 88
29 44 120 178 205 309 301 85 131 103 73 78 81
30 50   203 235 424 365 117 124 102 88 75 83
31 46   208   309   87 90   94   67