US Bridges

SR 121 over Derbyshire Falls

Fair

Franklin County, Indiana · 02.04 N US 52 · Structure no. 025950

Built
1985
40 years old, rebuilt 2012
Condition
Fair
inspected December 2024
Type
Slab
Concrete Continuous
Length
108 ft
3 main spans
Daily traffic
1,074
2021 count
Owner
State
State Highway Agency

About this bridge

SR 121 over Derbyshire Falls is a concrete continuous slab carrying SR 121 over Derbyshire Falls in Franklin County, Indiana. It was built in 1985 and reconstructed in 2012, so it is 40 years old, younger than the Indiana average of 46.6 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,074 vehicles a day, roughly 6% of them trucks, projected to reach 1,200 by 2041. The structure is 108 ft (32.8 m) long and 44 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesSR 121
CrossesDerbyshire Falls
Location02.04 N US 52
RouteState Highway 121
CountyFranklin County
StateIndiana
Coordinates39.47539, -85.19281
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length108 ft (32.8 m)
Longest span41 ft (12.4 m)
Deck width44 ft (13.5 m)
Roadway width42 ft (12.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,074 (2021)
Projected traffic1,200 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 121 over Derbyshire Falls built?

It was built in 1985, making it 40 years old in 2025. It was reconstructed in 2012.

What condition is SR 121 over Derbyshire Falls in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2024.

How much traffic does SR 121 over Derbyshire Falls carry?

About 1,074 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is SR 121 over Derbyshire Falls?

The structure is 108 ft (32.8 m) long with a longest span of 41 ft (12.4 m) and a deck 44 ft wide.

Who owns SR 121 over Derbyshire Falls?

It is owned by the State Highway Agency.