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CR 145 over Rat Root River

Koochiching County, Minnesota · rated Poor in the 2025 National Bridge Inventory

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

CR 145 over Rat Root River in Koochiching County, Minnesota, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1963, making it 62 years old at the 2025 inventory.
It carries about 44 vehicles a day (traffic count year 2021).
Its listed owner is the county highway agency.
It is one of 6 of the 98 inventoried bridges in Koochiching County rated poor (6.1%); 6 (6.1%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Timber stringer or multi-beam girder
Length	about 94 ft
Location	0.9 Mi W of Jct Th 53
NBI structure number	36503
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
Mn 11 over Stream	1949	5,227	Fair
Mn 11 over Dwp RR	2018	3,565	Good
US 53 over Rat Root River	1976	2,833	Fair
Mn 11 over Jack Fish Bay	2012	2,016	Good
Mn 11 over Tilson Creek	2012	2,016	Good
US 53 over E Br Rat Root River	1964	1,733	Good