US Bridges

SB US 61 over Dme RR

Fair

Scott County, Iowa · 0.8 Mi. N of JCT I-80 · Structure no. 000000000604645

Built
1981
44 years old
Condition
Fair
inspected April 2022
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
345 ft
3 main spans
Daily traffic
16,000
2022 count
Owner
State
State Highway Agency

About this bridge

SB US 61 over Dme RR is a steel continuous stringer/multi-beam or girder carrying SB US 61 over Dme RR in Scott County, Iowa. It was built in 1981, so it is 44 years old, younger 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 16,000 vehicles a day, roughly 11% of them trucks, projected to reach 16,000 by 2042. The structure is 345 ft (105.2 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSB US 61
CrossesDme RR
Location0.8 Mi. N of JCT I-80
RouteU.S. Route 61
CountyScott County
StateIowa
Coordinates41.60709, -90.56522
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 inspectionApril 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.5 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length345 ft (105.2 m)
Longest span131 ft (39.9 m)
Deck width56 ft (17.1 m)
Roadway width53 ft (16.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,000 (2022)
Projected traffic16,000 by 2042
Trucks11%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SB US 61 over Dme RR built?

It was built in 1981, making it 44 years old in 2025.

What condition is SB US 61 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 April 2022.

How much traffic does SB US 61 over Dme RR carry?

About 16,000 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is SB US 61 over Dme RR?

The structure is 345 ft (105.2 m) long with a longest span of 131 ft (39.9 m) and a deck 56 ft wide.

Who owns SB US 61 over Dme RR?

It is owned by the State Highway Agency.