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Rockwell Road over Portage Creek

Livingston County, Michigan · rated Good in the 2025 National Bridge Inventory

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

Rockwell Road over Portage Creek in Livingston County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1990, making it 35 years old at the 2025 inventory.
It carries about 117 vehicles a day (traffic count year 2013).
Its listed owner is the county highway agency.
It is one of 47 of the 165 inventoried bridges in Livingston County rated good (28.5%); 23 (13.9%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete tee beam
Length	about 55 ft
Location	Sec 31 Unadilla Twp
NBI structure number	000000000005894
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-96 EB Cd over US-23 NB	2016	516,020	Good
US-23 over M-36	1960	64,800	Poor
I-96 WB Cd over US-23 SB	2016	51,600	Good
I-96 WB over US-23 SB	2015	51,600	Fair
I-96 EB over US-23 NB	2015	51,600	Fair
I-96 WB over US-23 NB	2015	51,600	Fair