Place
- Borrow pit on Big Knob Road c. 3 mi from campground1
- Boulder Lake Trail, McCall1
- Brandon1
- Britannia near Ottawwa1
- Bush Bay, south side of M-134, 0.6 mile east of Cedarville1
- Butler1
- Campbell1
- Canyon near museum, Colton's Coyote Ranch1
- Capital1
- Cave Creek, Middle St. Vrain1
- Center Twp., off Van Rd.1
- Central Iowa1
- Chippewa1
- Chisago1
- Chocorua1
- Cima1
- Cisco1
- Clayton1
- Clearwater1
- Clinton1