US Bridges

Rock Bridge Drive over Unamed Ditch

Good

Boone County, Indiana · 00.01 N of CR 400 S · Structure no. 0600207

Built
2008
17 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete
Length
35 ft
1 main span
Daily traffic
170
2017 count
Owner
County
County Highway Agency

About this bridge

Rock Bridge Drive over Unamed Ditch is a concrete culvert carrying Rock Bridge Drive over Unamed Ditch in Boone County, Indiana. It was built in 2008, so it is 17 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 170 vehicles a day, roughly 1% of them trucks, projected to reach 260 by 2037. The structure is 35 ft (10.8 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesRock Bridge Drive
CrossesUnamed Ditch
Location00.01 N of CR 400 S
RouteCity Street 0
CountyBoone County
StateIndiana
Coordinates39.98365, -86.29763
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.9 US tons
Inventory rating35.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length35 ft (10.8 m)
Longest span35 ft (10.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic170 (2017)
Projected traffic260 by 2037
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Rock Bridge Drive over Unamed Ditch built?

It was built in 2008, making it 17 years old in 2025.

What condition is Rock Bridge Drive over Unamed Ditch 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 September 2023.

How much traffic does Rock Bridge Drive over Unamed Ditch carry?

About 170 vehicles per day (2017 count), of which roughly 1% are trucks.

How long is Rock Bridge Drive over Unamed Ditch?

The structure is 35 ft (10.8 m) long with a longest span of 35 ft (10.8 m).

Who owns Rock Bridge Drive over Unamed Ditch?

It is owned by the County Highway Agency.