All-Season Road Network Map with Weight Restricted Bridges
Isabella County Bridge with Weight Restrictions List
Weight restrictions will be enforced on all county blacktop and gravel roads in Isabella County
effective Saturday, February 14, 2026 at 6:00 a.m.
Maximum loadings permitted in accordance with Michigan laws are as follows:
11,700 pounds per single axle vehicles
20,800 pounds on tandem axle vehicles
with one tandem assembly (2 Axles)
16,900 pounds maximum for all other tandem assemblies
This maximum allowed loading reduces the normal loading 35% during the spring while the
frost is going out of the roadbed. Allowable speed limit for trucks on county roads during this
period is reduced to 35 mph.
These restrictions will be lifted after all the frost is gone and the roadbeds have dried out
sufficiently.
Tony Casali, Manager
Isabella County Road Commission