Home › Michigan › Ontonagon County › M-64 & M-38 over Ontonagon R River Rd RR

M-64 & M-38 over Ontonagon R River Rd RR

Ontonagon County, Michigan · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

M-64 & M-38 over Ontonagon R River Rd RR in Ontonagon County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 2005, making it 20 years old at the 2025 inventory.
It carries about 3,625 vehicles a day (traffic count year 2007).
Its listed owner is the state highway agency.
It is one of 31 of the 66 inventoried bridges in Ontonagon County rated fair (47.0%); 10 (15.2%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 1,696 ft
Location	Ontonagon
NBI structure number	000000000013265
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.

Bridge	Built	Vehicles/day	Condition
M-28 over So Br Ontonagon River	1990	2,398	Good
M-28 over M Br Ontonagon River	1929	2,303	Fair
M-28\|m-64 over Merryweather Creek	1932	2,120	Fair
M-64 over Cranberry River	1948	2,117	Fair
M-64 over Weigels Creek	1945	2,117	Fair
M-64 over Dreiss Creek	1945	2,117	Good