Public Sites
| State | County | Name |
|---|---|---|
| Iowa | Hardin | Calkins Nature Center |
| Iowa | Webster | Callender, Iowa |
| Iowa | Winneshiek | Calmar |
| Michigan | Kent | Calvin University |
| Iowa | Wright | Cambier River Bend |
| Colorado | Larimer | Cameron Pass |
| Iowa | Scott | Cameron Woods State Preserve |
| Iowa | Calhoun | Camp Creek @ Hwy N33 |
| Iowa | Calhoun | Camp Creek @ Hwy N37 |
| Iowa | Washington | Camp Creek @ Nutmeg Ave |
| Iowa | Polk | Camp Dodge |
| Iowa | Polk | Camp Sunnyside |
| Iowa | Linn | Campbell Cemetary |
| West Virginia | Tucker | Canaan Valley National Wildlife Refuge |
| Iowa | Johnson | Cangleska Wakan |
| Iowa | Winneshiek | Canoe Creek Access Area |
| Illinois | Jo Daviess | Canyon Camp |
| South Dakota | Pennington | Canyon Lake Park |
| Iowa | Polk | Capitol Park |
| Iowa | Louisa | Cappy Russell Access |
| New Mexico | Bernalillo | Capulin Springs |
| Iowa | Winneshiek | Cardinal Marsh State Wildlife Area |
| Colorado | Baca | Carizzo Canyon |
| Iowa | Webster | Carlson Recreation Area |
| Iowa | Monroe | Carmack County Park |