US Bridges

Ia 461 over Dme RR

Fair

Scott County, Iowa · 1.0 Mi. E of JCT Ia 22 · Structure no. 000000000046880

Built
1958
67 years old
Condition
Fair
inspected May 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
464 ft
6 main spans
Daily traffic
9,800
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 461 over Dme RR is a steel continuous girder and floorbeam system carrying Ia 461 over Dme RR in Scott County, Iowa. It was built in 1958, so it is 67 years old, older than the Iowa average of 45.5 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 9,800 vehicles a day, roughly 12% of them trucks, projected to reach 9,800 by 2042. The structure is 464 ft (141.4 m) long and 59 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIa 461
CrossesDme RR
Location1.0 Mi. E of JCT Ia 22
RouteState Highway 461
CountyScott County
StateIowa
Coordinates41.50156, -90.62165
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating44.4 US tons
Inventory rating26.7 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length464 ft (141.4 m)
Longest span88 ft (26.8 m)
Deck width59 ft (18.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,800 (2022)
Projected traffic9,800 by 2042
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ia 461 over Dme RR built?

It was built in 1958, making it 67 years old in 2025.

What condition is Ia 461 over Dme RR 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 Ia 461 over Dme RR carry?

About 9,800 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is Ia 461 over Dme RR?

The structure is 464 ft (141.4 m) long with a longest span of 88 ft (26.8 m) and a deck 59 ft wide.

Who owns Ia 461 over Dme RR?

It is owned by the State Highway Agency.