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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 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 -> 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 36 26 112 266 169 200 189 66 31 56 64 46
2 34 25 141 231 179 180 171 57 30 61 61 46
3 35 28 179 225 172 183 150 60 29 60 55 44
4 33 27 161 300 155 199 146 49 28 57 53 43
5 32 27 129 241 149 242 137 47 36 57 51 42
6 31 28 121 258 155 188 149 51 39 61 51 41
7 30 28 124 233 165 181 130 59 36 61 50 41
8 30 29 98 180 156 204 120 81 34 67 48 40
9 31 64 87 159 156 172 126 60 35 74 47 38
10 29 85 94 147 173 168 136 58 34 76 48 38
11 28 57 122 146 173 158 136 81 33 72 50 40
12 29 61 175 176 154 182 122 113 32 66 53 41
13 28 63 229 191 155 256 119 60 32 62 54 41
14 27 49 459 172 154 244 148 60 36 59 53 43
15 26 46 292 152 144 219 120 52 39 59 52 45
16 26 50 224 147 138 216 91 47 51 60 51 44
17 27 67 187 141 138 244 90 49 59 61 52 44
18 28 81 182 139 142 247 98 42 65 61 54 42
19 34 127 182 145 136 259 80 40 54 60 56 38
20 34 101 165 148 132 296 72 41 180 56 56 36
21 35 77 182 155 142 386 74 40 157 55 54 35
22 31 70 188 160 152 620 85 51 89 55 53 34
23 29 74 256 202 149 355 116 51 78 58 52 34
24 26 73 188 202 155 278 146 56 71 66 51 33
25 25 65 184 147 164 234 98 39 67 72 48 33
26 25 58 175 145 181 234 73 37 62 66 47 40
27 25 69 209 147 278 222 65 36 56 61 47 41
28 25 84 331 151 226 240 62 41 50 56 47 44
29 25 121 326 160 211 199 57 39 51 53 47 40
30 25   237 154 201 182 69 36 54 52 46 44
31 26   217   209   89 36   59   44