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M-25 over Howe Drain

St. Clair County, Michigan · rated Fair in the 2025 National Bridge Inventory

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

M-25 over Howe Drain in St. Clair 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 5 (fair condition) on the 0-9 scale.
It was built in 1981, making it 44 years old at the 2025 inventory.
It carries about 28,550 vehicles a day (traffic count year 2018).
Its listed owner is the state highway agency.
It is one of 165 of the 326 inventoried bridges in St. Clair County rated fair (50.6%); 31 (9.5%) 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 multiple box beam
Length	about 25 ft
Location	1.9 Mi NW of Port Huron
NBI structure number	000000000010023
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-94 over Stocks Creek Drain	2011	50,660	Good
I-94 & I-69 over M-25 Pine Grove Ave	1993	43,238	Good
M-25 over Black River Spillway	2000	40,250	Fair
I-94 over Stocks Creek	1964	29,650	Fair
I-94 & I-69 WB over Black River & Scott Ave	2011	26,010	Fair
I-94 EB over Belle River	2009	25,000	Good