US Bridges

US 421 over Little Monon Creek

Fair

White County, Indiana · 00.72 S SR 16 · Structure no. 076584

Built
2009
16 years old, rebuilt 2020
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
77 ft
1 main span
Daily traffic
6,960
2008 count
Owner
State
State Highway Agency

About this bridge

US 421 over Little Monon Creek is a prestressed concrete box beam or girders - single or spread carrying US 421 over Little Monon Creek in White County, Indiana. It was built in 2009 and reconstructed in 2020, so it is 16 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 6,960 vehicles a day, roughly 22% of them trucks, projected to reach 7,210 by 2028. The structure is 77 ft (23.6 m) long and 47 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS 421
CrossesLittle Monon Creek
Location00.72 S SR 16
RouteU.S. Route 421
CountyWhite County
StateIndiana
Coordinates40.85754, -86.879
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.4 US tons
Inventory rating43.5 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length77 ft (23.6 m)
Longest span74 ft (22.7 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,960 (2008)
Projected traffic7,210 by 2028
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 US 421 over Little Monon Creek built?

It was built in 2009, making it 16 years old in 2025. It was reconstructed in 2020.

What condition is US 421 over Little Monon 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 May 2023.

How much traffic does US 421 over Little Monon Creek carry?

About 6,960 vehicles per day (2008 count), of which roughly 22% are trucks.

How long is US 421 over Little Monon Creek?

The structure is 77 ft (23.6 m) long with a longest span of 74 ft (22.7 m) and a deck 47 ft wide.

Who owns US 421 over Little Monon Creek?

It is owned by the State Highway Agency.