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Henderson Road over Porter Creek

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

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

Henderson Road over Porter Creek in Shiawassee County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 2002, making it 23 years old at the 2025 inventory.
It carries about 190 vehicles a day (traffic count year 2011).
Its listed owner is the county highway agency.
It is one of 76 of the 163 inventoried bridges in Shiawassee County rated fair (46.6%); 15 (9.2%) 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 multiple box beam
Length	about 49 ft
Location	3.9 Mi SW of New Lothrop
NBI structure number	000000000009801
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-69 EB over Looking Glass River	1961	192,000	Fair
I-69 WB over Looking Glass River	1961	192,000	Fair
I-69 EB over Holly Drain	1961	192,000	Fair
I-69 WB over Holly Drain	1961	192,000	Fair
Britton Rd over I-69	1989	25,000	Fair
M-21 over Shiawassee River	1970	22,689	Fair