The Heart of Iowa Nature trail is a 32 mile trail, some surface is limestone, offer views of prairie remnants east of Slater, a pioneer cemetery and historical museum in Maxwell, heavily wooded tracts near Cambridge and Maxwell and two wetland areas west of Cambridge. Between Collins and Rhodes, trail users cross the Hoy Bridge, which is 212 feet long and 60 feet tall. This unique, massive concrete arch bridge was built in 1912 to accommodate a double railroad over Clear Creek. For road bikes, the best sections to ride are from Slater to Cambridge and two miles east of Collins to Rhodes. While the trail is surfaced for 3.2 miles between Maxwell and Collins, currently it is undeveloped from the Maxwell city park on First St. to the city limits (approximately one-half mile). The undeveloped trail is relatively flat in that area but has a dirt surface only. At 690th Ave. there is a break in the trail. We recommend taking the gravel north to 310th St. and then east into Collins. For off-road enthusiasts, the undeveloped trail between Cambridge and Maxwell offers great scenery and some challenges. Sections of the trail are wet, others are bumpy, but there is a lot of beauty to be seen in these areas.