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USGS Surface-Water Daily Statistics for Iowa

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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 06600100 Floyd River at Alton, IA


Sioux County, Iowa
Hydrologic Unit Code 10230002
Latitude  42°58'58.1", Longitude  96°00'01.2" NAD83
Drainage area 268  square miles
Gage datum 1,270.17 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 1955-10-01 -> 2024-09-30)

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 36 26 114 270 166 185 183 66 31 57 64 47
2 34 25 143 234 175 158 165 57 30 61 62 46
3 35 28 181 227 166 166 145 60 29 60 56 45
4 33 28 164 305 150 186 143 49 28 57 54 43
5 32 28 132 244 145 235 133 47 36 57 52 42
6 31 29 124 262 151 183 145 51 39 61 51 41
7 30 28 127 237 158 177 127 59 36 62 50 41
8 30 29 101 183 144 202 117 81 34 68 49 40
9 31 64 88 161 141 170 123 60 35 75 47 38
10 29 87 96 149 156 166 134 59 34 77 48 38
11 28 58 124 148 163 156 134 82 33 73 50 41
12 29 62 179 178 149 181 120 114 32 66 54 41
13 28 64 235 194 151 258 117 60 32 63 55 41
14 27 50 471 175 152 246 147 60 36 60 53 43
15 26 46 299 154 142 220 120 52 40 60 52 45
16 26 50 230 148 136 217 90 47 52 60 51 44
17 27 68 191 141 137 242 89 49 60 61 52 44
18 29 82 187 137 141 240 97 42 66 62 54 42
19 35 129 187 141 135 254 80 40 55 60 56 38
20 34 102 169 146 132 295 72 41 182 57 56 37
21 36 78 187 154 140 376 74 40 159 55 55 35
22 31 71 193 160 144 339 85 51 90 56 54 35
23 29 75 263 204 140 284 116 51 79 58 52 34
24 26 73 193 204 150 242 147 56 72 67 51 33
25 26 65 187 148 159 217 99 39 68 73 48 33
26 25 58 175 146 178 227 74 37 62 67 47 40
27 25 70 210 147 279 216 65 36 56 62 47 42
28 25 86 336 151 226 234 62 41 51 57 47 45
29 25 121 332 158 212 187 57 39 51 54 47 40
30 25   240 150 202 173 68 36 55 53 47 44
31 26   220   207   89 36   59   44