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SR 39 over Grassy Branch

Boone County, Indiana · rated Good in the 2025 National Bridge Inventory

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

SR 39 over Grassy Branch in Boone County, Indiana, 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 1936, making it 89 years old at the 2025 inventory.
It carries about 3,218 vehicles a day (traffic count year 2021).
Its listed owner is the state highway agency.
It is one of 118 of the 292 inventoried bridges in Boone County rated good (40.4%); 12 (4.1%) 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	Concrete stringer or multi-beam girder
Length	about 30 ft
Location	04.16 N I-74
NBI structure number	013270
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-65 over Prairie Creek	1948	73,132	Fair
CR 100 Ehall-baker over I-65 Sb/nb	1958	73,132	Fair
I-65 over Prairie Creek	2010	73,132	Good
I-465 WB over Zionsville Road	1967	57,399	Fair
I-65 NB over Prairie Creek Trail	2014	57,066	Fair
I-65 SB over Prairie Creek Trail	2014	57,066	Fair