US Bridges

SR 39 over Grassy Branch

Good

Boone County, Indiana · 04.16 N I-74 · Structure no. 013270

Built
1936
89 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
31 ft
1 main span
Daily traffic
3,218
2021 count
Owner
State
State Highway Agency

About this bridge

SR 39 over Grassy Branch is a concrete stringer/multi-beam or girder carrying SR 39 over Grassy Branch in Boone County, Indiana. It was built in 1936, so it is 89 years old, older than the Indiana average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,218 vehicles a day, roughly 11% of them trucks, projected to reach 3,590 by 2030. The structure is 31 ft (9.4 m) long and 35 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesSR 39
CrossesGrassy Branch
Location04.16 N I-74
RouteState Highway 39
CountyBoone County
StateIndiana
Coordinates39.94887, -86.52113
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating32.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length31 ft (9.4 m)
Longest span28 ft (8.5 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,218 (2021)
Projected traffic3,590 by 2030
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 39 over Grassy Branch built?

It was built in 1936, making it 89 years old in 2025.

What condition is SR 39 over Grassy Branch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does SR 39 over Grassy Branch carry?

About 3,218 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is SR 39 over Grassy Branch?

The structure is 31 ft (9.4 m) long with a longest span of 28 ft (8.5 m) and a deck 35 ft wide.

Who owns SR 39 over Grassy Branch?

It is owned by the State Highway Agency.