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Frost Street over Dowagiac River

Cass County, Michigan · rated Poor in the 2025 National Bridge Inventory

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

Frost Street over Dowagiac River in Cass County, Michigan, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1930, making it 95 years old at the 2025 inventory.
It carries about 56 vehicles a day (traffic count year 2019).
Its listed owner is the county highway agency.
It is one of 8 of the 53 inventoried bridges in Cass County rated poor (15.1%); 8 (15.1%) 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	Steel stringer or multi-beam girder
Length	about 46 ft
Location	4 Mi W of M-51
NBI structure number	000000000001454
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
US-12 over M-60	1960	9,010	Fair
M-51 over Dowagiac Creek	1949	8,127	Fair
US-12 over Christiana Creek	1941	8,072	Fair
US-12 over Brandywine Creek	1982	7,438	Fair
M-62 over Dowagiac Creek	1950	7,355	Fair
US-12 over Valley Creek	2011	7,350	Good