US Bridges

US 421 over Kilmore Creek

Fair

Clinton County, Indiana · 00.31 S SR 38 · Structure no. 032210

Built
1941
84 years old, rebuilt 2015
Condition
Fair
inspected July 2023
Type
Truss - Thru
Steel
Length
129 ft
1 main span
Daily traffic
3,870
2012 count
Owner
State
State Highway Agency

About this bridge

US 421 over Kilmore Creek is a steel truss - thru carrying US 421 over Kilmore Creek in Clinton County, Indiana. It was built in 1941 and reconstructed in 2015, so it is 84 years old, older 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 5 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 3,870 vehicles a day, roughly 8% of them trucks, projected to reach 4,310 by 2030. The structure is 129 ft (39.3 m) long and 29 ft wide. If it were closed, the detour would be 13.7 mi (22 km).

Location

Open in Google Maps
CarriesUS 421
CrossesKilmore Creek
Location00.31 S SR 38
RouteU.S. Route 421
CountyClinton County
StateIndiana
Coordinates40.34038, -86.56423
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length129 ft (39.3 m)
Longest span125 ft (38 m)
Deck width29 ft (8.8 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,870 (2012)
Projected traffic4,310 by 2030
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13.7 mi (22 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

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

Frequently asked questions

When was US 421 over Kilmore Creek built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 2015.

What condition is US 421 over Kilmore Creek 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 July 2023.

How much traffic does US 421 over Kilmore Creek carry?

About 3,870 vehicles per day (2012 count), of which roughly 8% are trucks.

How long is US 421 over Kilmore Creek?

The structure is 129 ft (39.3 m) long with a longest span of 125 ft (38 m) and a deck 29 ft wide.

Who owns US 421 over Kilmore Creek?

It is owned by the State Highway Agency.