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I 90 over Sep Heeb Road

Gallatin County, Montana · rated Good in the 2025 National Bridge Inventory

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

I 90 over Sep Heeb Road in Gallatin County, Montana, 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 1965, making it 60 years old at the 2025 inventory.
It carries about 9,726 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 43 of the 212 inventoried bridges in Gallatin County rated good (20.3%); 12 (5.7%) 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 stringer or multi-beam girder
Length	about 115 ft
Location	2.5M E Manhattan
NBI structure number	I00090291+06372
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
N Seventh Ave over Int N 7TH Ave-i 90	2014	26,020	Fair
US 191-huffine Ln over Hyalite Creek	1956	25,670	Fair
N 19TH Ave over Int N 19TH Ave	1994	23,992	Fair
I 90 over Walking Path	2011	21,232	Fair
I 90 over Int Airway Blvd	2014	15,554	Fair
I 90 over Int Airway Blvd	2014	15,554	Fair