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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 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 26 114 269 171 203 188 66 31 57 64 47
2 34 25 143 233 181 182 170 57 30 61 62 46
3 35 28 181 226 174 185 150 60 29 60 56 45
4 33 28 164 302 157 200 147 49 28 57 54 43
5 32 28 131 242 151 243 137 47 36 57 52 42
6 31 29 123 260 156 189 149 51 39 61 51 41
7 30 28 125 236 167 182 131 59 36 62 50 41
8 30 29 100 182 158 205 120 81 34 68 49 40
9 31 64 88 161 158 174 126 60 35 75 47 38
10 29 87 95 148 175 170 136 58 34 77 48 38
11 28 58 123 147 175 159 136 81 33 73 50 41
12 29 62 177 177 156 183 122 113 32 66 54 41
13 28 64 232 193 157 259 119 60 32 63 55 41
14 27 50 465 174 156 247 148 60 36 60 53 43
15 26 46 295 153 146 221 120 52 39 60 52 45
16 26 50 227 149 140 218 91 47 52 60 51 44
17 27 68 189 142 140 245 90 49 60 61 52 44
18 29 82 185 140 144 249 98 42 66 62 54 42
19 35 129 185 146 137 262 80 40 55 60 56 38
20 34 102 167 150 134 300 72 41 182 57 56 37
21 36 78 185 156 144 391 74 40 159 55 55 35
22 31 71 191 161 153 628 85 51 90 56 54 35
23 29 75 260 205 150 360 116 51 79 58 52 34
24 26 73 191 204 157 282 146 56 72 67 51 33
25 26 65 186 148 166 236 98 39 68 73 48 33
26 25 58 177 147 183 236 73 37 62 67 47 40
27 25 70 211 149 281 223 65 36 56 62 47 42
28 25 86 335 153 229 242 62 41 51 57 47 45
29 25 121 330 162 214 195 57 39 51 54 47 40
30 25   240 155 204 179 69 36 55 53 47 44
31 26   219   212   89 36   59   44