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United States | Iowa | Butler | Beaver Creek, 3.5 mi W of Aplington | drainage:Beaver Creek | 90N | 18W | 22

United States | Iowa | Benton | Cedar River at Benton City Fry Recreation Area access, 4.5 mi E Vinton | drainage:Cedar River | 85N | 9W | 20

United States | Iowa | Franklin | Maynes Creek, at S edge of Coulter | drainage:Maynes Creek | 91N | 21W | 6

United States | Iowa | Muscatine | Cedar River at Saulsbury Bridge Access | drainage:Cedar R. -> Iowa R. -> Mississippi R. | 77 N | 3 W | 3

United States | Iowa | Johnson | Pechman Creek, 1 mi S and 0.25 mi E of Hills | drainage:Pechman Creek | 78N | 6W | 26

United States | Massachusetts | Plymouth

United States | Iowa | Benton | Lime Creek, 4 mi E and 2.5 mi N of Mt Auburn | drainage:Lime Creek | 86N | 10W | 4

United States | Utah | Summit

United States | Iowa | Johnson | Iowa River, at Sturgis Ferry Park, Iowa City | drainage:Iowa River | 79N | 6W | 22

United States | Iowa | Wapello | Sugar Creek, ~ 1.5 miles E of Ottumwa, between 100th and 90th streets | drainage:Des Moines R. -> Mississippi R. | 72 N | 13 W | 21

United States | Iowa | Allamakee | Little Paint Creek, at Yellow River State Forest, ~ 12 miles ESE of Waukon; upstream from end of Donahue Rd. | drainage:Paint Cr. -> Mississippi R. | 97 N | 3 W | 19

United States | Iowa | Hardin | Minerva Creek, 3 mi NW of Zearing | drainage:Minerva Creek | 85/86N | 21W | 35/2

United States | Iowa | Hardin | Tipton Creek, ~ 3 miles ENE of Hubbard, upstr N Ave. | drainage:Iowa R. -> Mississippi R. | 87 N | 21 W | 25

United States | Iowa | Linn | Big Creek, ~ 2.5 miles NW of Springville, upstr. County Home Rd. | drainage:Cedar R. -> Iowa R. -> Mississippi R. | 84 N | 5 W | 18

United States | Iowa | Jones | Whitewater Creek, ~ 3.5 miles SE of Cascade, upstr. CoRd D61 | drainage:Maquoketa R. -> Mississippi R. | 86 N | 1 W | 11

United States | Iowa | Greene | Snake Creek, ~ 1 mile S of Rippey | drainage:Raccoon R. -> Des Moines R. -> Mississippi R. | 82 N | 29 W | 14

United States | Iowa | Guthrie | Middle Raccoon River, ~ 5 miles SW of Bayard, dstr. from bridge on Fig Ave. | drainage:Raccoon R. -> Des Moines R. -> Mississippi R. | 81 N | 33 W | 24

United States | Iowa | Webster | South Branch Lizard Creek, at Lizard Creek State Wildlife Area, ~ 3 miles WSW of Fort Dodge | drainage:Des Moines R. -> Mississippi R. | 89 N | 29 W | 33

United States | Iowa | Allamakee | Village Creek, ~ 3.25 miles SSW of Lansing, upstream from bridge on Lansing-Harpers Rd. | drainage:Mississippi River | 98 N | 3 W | 18

United States | Iowa | Decatur | Steel Creek, ~ 4.5 miles SE of Garden Grove, on Scott property | drainage:Thompson R. -> Grand R. -> Missouri R. | 69 N | 23 W | 13

United States | Iowa | Linn | Indian Creek, at, and upstr from, Bertram Rd bridge, Cedar Rapids | drainage:Cedar R. -> Iowa R. -> Mississippi R. | 83 N | 6 W | 30

United States | Iowa | Muscatine | Mud Creek at the Hwy 6/38 crossing at Wilton | drainage:Cedar R. -> Iowa R. -> Mississippi R. | 78 N | 2 W | 11

United States | Minnesota | Cook | Pigeon River, ~ 1 mile SSE of dam at South Fowl Lake, at downriver end of portage to avoid dam. | drainage:Lake Superior | 64 N | 3 E | 13

United States | Iowa | Buchanan | Bear Creek, ~ 3.5 miles S of Independence at 265th St., at & upstr from bridge | drainage:Cedar R. -> Iowa R. -> Mississippi R. | 88 N | 9 W | 27

United States | Iowa | Palo Alto | Jack Creek at West Fork WMA, ~ 3.5 miles SSE of Graettinger | drainage:Des Moines R. -> Mississippi R. | 97 N | 33 W | 26

Argentina | Buenos Aires | La Colina

United States | Iowa | Lyon | Rock River, at Rock Rapids Country Club, N of Rock Rapids; at CoRd A16 | drainage:Big Sioux R -> Missouri R. | 100 N | 45 W | 20

United States | Iowa | Lyon | Little Rock River, ~ 3 miles SW of Little Rock | drainage:Rock R. -> Big Sioux R. -> Missouri R. | 99 N | 43 W | 4

United States | Iowa | Tama | Salt Creek, ~ 3 miles S of Elberon, dstr from Hwy 30 | drainage:Iowa R. -> Mississippi R. | 83 N | 13 W | 36

United States | Iowa | Clayton | Mississippi River backwater at Sny Magil Access, ~ 6.5 miles S of McGgregor | drainage:Mississippi River | 94 N | 3 W | 23

United States | Minnesota | Lake | Thomas Lake, ~ 29 mi ENE of Ely | drainage:Rainy R. -> Lake of the Woods -> Hudson Bay | 64 N | 7 W | 33

United States | Iowa | Clay | Little Sioux River at Hawk Valley WMA, ~ 3 miles E of Spencer, dstr Hwy 18 | drainage:Missouri River | 96 N | 36 W | 22

United States | Nebraska | Cass | Schilling Lake, ~ 2 miles north of Plattsmouth, NE | drainage:Missouri River | 12 N | 14 E | 6

United States | Nebraska | Thurston | Big Bear Park backwater, ~ 9 miles SE of Homer, Ne | drainage:Missouri River | 26 N | 10 E | 7

United States | Iowa | Lucas | Chariton River at Chariton River Greenbelt, ~ 2.5 miles S of Chariton | drainage:Missouri River | 71 N | 21 W | 5

United States | Iowa | Dallas | Middle Raccoon River at Big Bend WMA, ~ 2.3 miles WNW of Redfield | drainage:Raccoon R. -> Des Moines R. -> Mississippi R. | 79 N | 29 W | 33

United States | Iowa | Decatur | Long Creek, Dekalb WMA, ~ 5.5 miles ENE of Grand River | drainage:Grand R. -> Missouri R. | 70 N | 26 W | 28

United States | Iowa | Buena Vista | Cottonwood Creek at Glacial Hills Presrve, ~ 2.5 miles SSE of Peterson | drainage:Little Sioux R. -> Missouri R. | 93 N | 38 W | 10

United States | Iowa | Mitchell | Deer Creek, 2 mi NW of St. Ansgar on CR T12 | drainage:Cedar R. -> Iowa R. -> Mississippi R. | 99N | 18W | 15

United States | Iowa | Iowa | Bear Creek, 2 mi SW Marengo | drainage:Bear Creek | 81N | 11W | 34

United States | Iowa | Dickinson | Spirit Lake near Crandall's Lodge | drainage:Little Sioux R. -> Missouri R. | 100N | 36W | 9

United States | Iowa | Wright | Luicks Creek, 0.25 mi SE of Belmond | drainage:Luicks Creek | 93N | 23W | 31

United States | Iowa | Franklin | Iowa River, 1 mi N of Dows | drainage:Iowa River | 91N | 23W | 24

United States | Tennessee | Clay

United States | Iowa | Cedar | Rock Creek, 2.5 mi S and 1.5 mi W of Tipton | drainage:Rock Creek | 80N | 3W | 14

United States | Iowa | Linn | Cedar Lake, at Cedar Rapids | drainage:Cedar River | 83N | 7W | 16

United States | Iowa | Franklin | Spring Creek, City Park, N side of Hampton | drainage:Spring Creek | 92N | 20W | 21

United States | Iowa | Wright | Cutoff Channel of Iowa River, 4 mi of Galt | drainage:Iowa River | 92N | 24W | 25

United States | Iowa | Linn | Marion Springs | 84N | 7W | 35

United States | Iowa | Louisa | Smith Creek, 4 mi E and 1 mi S of Morning Sun | drainage:Smith Creek | 77N | 3W | 35