90º 89º 88º ! ! ! East ! Menominee Scales Mound ! ! Apple Orangeville South !Antioch ! Winthrop Harbor Dubuque ! Warren Winslow River ! Beloit ! ! ! Lake Durand Rockton Zion Galena Nora Rock Davis ! Harvard ! ! ! Lindenhurst ! City ! Capron MCHENRY ! Roscoe ! Lena Cedarville ! !Wonder !Fox Lake ! Michigan JO DAVIESS ! ! Dakota Machesney ! Poplar Lake Gurnee ! Waukegan ! Park ! Grove McHenry ! ! Elizabeth Stockton ! Grayslake ! North Chicago ! WINNEBAGO Loves Park ! Woodstock LAKE ! BOONE Watershed Freeport ! ! Pecatonica ! ! Lake Bluff Pearl City Ridott ! Hanover ! ! Rockford Belvidere Crystal Libertyville ! ! ! ! Lake Forest STEPHENSON Winnebago ! Lake ! Wauconda ! German Valley ! Cherry Marengo Cary Vernon ! Valley Lake in ! Highland Park Lake Hills the Hills ! ! ! Zurich Shannon ! Morristown ! Algonquin ! Adeline Kishwaukee ! ! Northbrook Major ! Byron Barrington Buffalo ! Chicago/ Forreston ! ! ! ! Palatine CARROLL Hampshire ! Grove ! Genoa Carpentersville ! Lanark Leaf River ! Kirkland ! ! !Gilberts ! Davis ! ! Arlington Heights ! Savanna Stillman ! Mount Glenview Mount Junction Kingston Hoffman ! Valley ! ! Prospect Calumet Estates Carroll Mount ! ! Pingree ! ! Des Plaines Morris OGLE Burlington Grove ! ! Skokie Elgin Streamwood Elk Grove ! ! ! Chadwick Oregon! ! ! Park 42º 42º Polo Schaumburg Village ! ! Ridge Watersheds Thomson Hanover Park ! ! Hillcrest ! Carol Glendale Milledgeville DeKalb Addison Creston Malta KANE Stream Heights ! ! ! ! Cortland ! ! Rock Rochelle ! ! Maple Park ! ! St. Charles ! Elmhurst ! Coleta ! ! Oak Park DEKALB Geneva ! DUPAGE ! ! Chicago Elburn Wheaton Lombard ! Ashton ! ! Berwyn Lake ! Steward! Batavia !! ! Dixon Morrison Franklin Grove Cicero ! Lee Des Plaines of Illinois Sterling ! ! ! Michigan ! Nelson Fox Naperville ! Waterman ! Downers Grove WHITESIDE ! ! ! Albany ! ! Aurora ! Rock Falls Shabbona Hinckley Sugar Grove !Woodridge LEE Oak Lawn Harmon ! Lyndon ! ! Illinois State Water Survey ! Amboy Compton Boulder Hill ! Bolingbrook ! West Brooklyn ! ! ! ! ! Erie ! Plano Cordova Paw ! Oswego ! Prophetstown Sandwich Yorkville Romeoville! Tampico Sublette! Paw Somonauk ! ! ! ! ! ! ! Hillsdale ! ! Plainfield COOK Calumet Port Byron Deer ! Earlville 91º Grove ! Leland City ! Walnut Millington ! Hampton ! ! Mendota KENDALL ! Rapids City ! Arbury Hills Ohio Mokena ! ! Hooppole La Moille ! Shorewood ! East Moline New ! Sheridan ! ! ! ! Joliet ! Park Chicago Rock Island ! Silvis Bedford ! Newark ! Frankfort ! ! ! Moline ! Forest Heights ! Lisbon Rockdale New ! Carbon Arlington ! !! ! Troy Grove Lenox Cliff Colona BUREAU ! ! ! Green ! Geneseo Manlius! Minooka ! Crete ! Milan Cherry LA SALLE Channahon ! Rock Dover ! ! ! Andalusia Oak ! ! Elwood ! ! Green Malden ! Grove Coal Manhattan Monee Valley ! Mineral Ladd ROCK ISLAND HENRY ! Princeton ! Morris Annawan Wyanet Seatonville Orion ! ! Dalzell La ! WILL ! ! ! ! Ottawa ! ! Sheffield Peotone ! Beecher Reynolds Hollowayville Salle ! Marseilles Symerton ! ! Sherrard Spring Peru ! Utica ! ! Seneca ! ! ! Buda ! Valley ! ! ! Cambridge De Pue Naplate ! ! Tiskilwa ! ! Carbon Hill! Wilmington Andover ! ! Bureau Oglesby Mississippi Matherville ! Mark Neponset Junction ! ! Standard GRUNDY Central ! Hennepin ! ! ! Grand Ridge City Braidwood ! River Valley ! ! ! ! Kankakee Granville Tonica Verona ! Grant Park Joy Aledo Viola Alpha Kewanee ! ! Mazon Braceville ! ! ! Bishop Hill ! Windsor ! ! ! New Woodhull PUTNAM ! ! Gardner Momence ! ! Essex ! ! Boston Galva Bradford ! ! Kinsman ! Bourbonnais ! Leonore South Bonfield ! Ransom ! ! McNabb ! ! ! Bradley MERCER ! Wilmington Lostant Clark City ! Sun River Terrace Rio Altona La Fayette Kangley ! Streator ! Kankakee Keithsburg ! ! ! Henry ! Magnolia ! ! ! STARK ! ! KANKAKEE ! ! South Streator ! Dwight Reddick ! Seaton North Henderson Oneida Aroma Park ! ! Toulon ! MARSHALL Buckingham Irwin ! Wyoming Wenona ! ! ! ! Pembroke Alexis Victoria Varna Campus Henderson ! ! Herscher ! St. Anne Little York ! ! Wataga Sparland ! ! ! ! Lacon Odell Chebanse 41º 41º Toluca ! Cabery ! ! ! Papineau !Rutland Emington ! La Rose ! ! Galesburg KNOX ! ! ! Clifton ! Beaverville WARREN East Galesburg Princeville Dana ! ! ! Washburn LIVINGSTON ! ! PEORIA ! ! Kempton ! ! Knoxville Chillicothe Martinton Monmouth Williamsfield ! Saunemin Ashkum ! Minonk Flanagan Pontiac ! ! Gladstone Kirkwood ! ! ! ! Donovan ! Biggsville ! Dunlap Rome ! ! Benson Cullom Brimfield ! Spoon ! Vermilion Gulf Port ! HENDERSON ! Spring Bay ! Roanoke Crescent Maquon ! Germantown ! Sheldon Media Abingdon Yates ! Panola City ! ! ! ! Hills ! ! City ! Illinois Peoria Gilman ! ! Metamora WOODFORD ! Watseka Elmwood (Illinois Basin)! ! Heights El Paso ! Roseville ! ! ! ! ! Piper City ! Secor ! Chatsworth Stronghurst St. Augustine River Valley Eureka Forrest IROQUOIS ! ! ! Gridley Chenoa Fairbury Onarga! ! Norwood Peoria Washington Lomax ! ! ! ! Woodland Raritan ! ! London Mills Hanna City ! Avon Bellevue ! Thawville ! ! Mackinaw Strawn East Peoria ! ! Dallas City Bartonville ! ! ! Ellisville Creve Coeur ! Milford ! ! Deer ! Roberts Pontoosuc ! Prairie ! ! ! Iroquois Norris North Fairview ! Creek ! City Pekin ! Morton ! Melvin Buckley Glasford Mapleton ! Carlock Colfax Anchor Sibley ! Nauvoo Blandinsville Good Hope ! Towanda ! ! ! ! La ! ! ! ! ! Pekin ! Wellington ! ! Cissna Park ! Harpe Bushnell Canton ! ! Sciota Tremont ! Banner Kingston ! ! Cooksville ! Loda Bardolph Marietta ! South Mackinaw ! FORD ! Cuba Mines Danvers Normal ! ! Dunfermline !Pekin Ferris St. David! ! ! ! Smithfield Bloomington ! Macomb ! ! ! ! Rankin ! ! Arrowsmith ! Elliott Hoopeston TAZEWELL ! ! Gibson City Paxton FULTON Stanford Saybrook Carthage Bryant ! ! MCLEAN MCDONOUGH ! Hopedale Ellsworth ! Hamilton ! ! Minier ! ! Manito ! Downs Rossville Lewistown ! ! Elvaston ! Liverpool ! Green Valley ! Ludlow ! Table Grove VERMILION Warsaw ! Ipava ! ! Le Roy ! Basco ! Bentley ! Forest Delavan Armington ! ! Industry Topeka ! ! Foosland La Moine ! ! City McLean Heyworth ! Rantoul ! ! Bellflower Fisher ! ! HANCOCK Vermont ! Emden Gifford ! ! ! ! Vermilion Plymouth San Jose Havana West Point ! Hartsburg ! Thomasboro Littleton ! Farmer City ! ! ! Augusta Astoria Easton Atlanta ! Bowen ! ! ! Wapella Mansfield ! ! (Wabash Basin) Waynesville ! Mason Mahomet MASON ! De Witt ! ! Lima ! ! Bath City New ! CHAMPAIGN Loraine SCHUYLER ! LOGAN DE WITT Royal ! La Prairie Camden Holland Vermilion ! ! Kilbourne ! Danville ! ! Heights ! Browning Lincoln Weldon Muncie ! ! Clinton De Land Champaign Urbana St. Joseph ! ! !Rushville ! ! ! ! ! ! ! Golden ! ! ! ! Central Mendon ! Ogden Fithian Oakwood ! Oakford Middletown ! ! Bondville Tilton Park ! Broadwell Kenney ! Ursa ! ! Fairmount ! PIATT ! Coatsburg ! ! Greenview Homer ! Catlin Belgium ! BROWN ! Savoy Sidney ! ! Chandlerville Maroa ! Monticello ! 40º Camp Point Ripley ! Philo 40º Clayton ! ! Beardstown Petersburg ! MENARD ! Cisco ! M ! Sangamon Georgetown ADAMS Mound ! ! Columbus Mount Sterling ! ! Station CASS Athens ! ! ! Williamsville Argenta Ivesdale Tolono I ! ! Tallula ! Oreana ! Indianola Quincy ! Cantrall Warrensburg Forsyth Sadorus ! La Grange Virginia ! ! ! ! Bement Sidell S ! Pesotum ! Broadlands ! ! Allerton ! Ridge Farm Versailles ! Illinois Arenzville Sherman ! MACON ! ! ! ! Cerro Longview S ! Ashland Pleasant ! ! Spaulding Gordo Liberty Plains ! Illiopolis Niantic Decatur ! ! ! Buffalo ! ! ! Villa Grove I River Valley Riverton ! ! Payson Dawson Harristown ! ! Meredosia Concord ! Chrisman S ! Long Tuscola Newman Hume ! ! Hammond ! ! ! ! Perry ! Clear Creek ! Atwood! ! ! ! Camargo Metcalf ! Plainville Springfield Mechanicsburg S ! Chapin Lake Garrett Berlin ! Bluffs ! ! ! ! I ! Jacksonville ! ! Mount Zion Wabash Mount Auburn Hull Baylis ! Naples ! Southern Lovington Brocton ! Griggsville ! Exeter ! Rochester Dalton City ! DOUGLAS ! P South ! New Berlin ! ! ! Barry New Salem ! ! ! MORGAN View ! Macon Arthur ! Jacksonville ! Blue Arcola ! River Valley P Kinderhook Valley ! Loami Chatham Mound ! City Lynnville ! ! Edinburg Hindsboro New Canton SCOTT ! MOULTRIE ! EDGAR ! Stonington ! ! I PIKE Detroit ! Oakland ! ! Florence ! ! Franklin SANGAMON Redmon ! Winchester Woodson ! ! Moweaqua Bethany Humboldt ! El Dara ! Paris R Auburn Pawnee Bulpitt ! ! Pittsfield ! ! ! ! CHRISTIAN ! ! Murrayville ! Kincaid Sullivan Kansas Milton Alsey Waverly Divernon ! Vermilion I ! ! ! ! Taylorville ! Glasgow! Thayer ! V Time ! ! Grandview Manchester ! Assumption Allenville COLES ! E ! Findlay ! Ashmore ! Wilmington Roodhouse Virden ! Owaneco Pleasant ! ! Scottville Modesto ! ! Charleston R Pearl ! ! Mattoon Hill Palmer ! Nebo ! ! Westfield ! ! White Hall Girard ! SHELBY ! ! Palmyra ! Hillview ! Morrisonville Windsor ! Lerna Farmersville ! ! Marshall Nilwood Pana Shelbyville ! ! ! ! ! Standard ! Hettick Waggoner Harvel Tower Hill Strasburg Martinsville CALHOUN GREENE ! ! City ! Ohlman ! 91º ! ! Neoga ! Raymond Wenonah ! ! Kampsville Greenfield ! ! CLARK ! ! Macoupin ! Oconee Casey ! Eldred Rockbridge Nokomis ! CUMBERLAND Carrollton ! ! MONTGOMERY ! ! Carlinville Coalton ! Cowden Stewardson Toledo Greenup ! ! Witt ! ! Chesterfield Sigel Hamburg ! Herrick ! Jewett ! ! Butler Kane ! Irving Beecher Embarras ! ! Medora ! City ! ! ! Montrose MACOUPIN Litchfield ! Schram City Shumway ! ! Hardin! Fidelity ! Hidalgo ! East Gillespie Hillsboro Ramsey Teutopolis Royal ! ! Yale Shipman ! Taylor ! ! Hutsonville Fieldon Jerseyville ! Lakes Gillespie ! Fillmore ! ! ! Eagarville ! Rose Hill ! ! Springs ! ! ! Benld Bingham Effingham ! ! ! Coffeen JERSEY ! Mount ! Dorchester Walshville ! EFFINGHAM !