US Bridges

Ia 48 over Red Oak Creek

Fair

Montgomery County, Iowa · 1.3 MI S of Jct. US 34 · Structure no. 000000000037710

Built
1918
107 years old, rebuilt 1951
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
42 ft
1 main span
Daily traffic
4,460
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 48 over Red Oak Creek is a steel stringer/multi-beam or girder carrying Ia 48 over Red Oak Creek in Montgomery County, Iowa. It was built in 1918 and reconstructed in 1951, so it is 107 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 4,460 vehicles a day, roughly 8% of them trucks, projected to reach 4,460 by 2044. The structure is 42 ft (12.8 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIa 48
CrossesRed Oak Creek
Location1.3 MI S of Jct. US 34
RouteState Highway 48
StateIowa
Coordinates41.00745, -95.23275
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.8 US tons
Inventory rating28.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length42 ft (12.8 m)
Longest span39 ft (11.9 m)
Deck width60 ft (18.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,460 (2022)
Projected traffic4,460 by 2044
Trucks8%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 48 over Red Oak Creek built?

It was built in 1918, making it 107 years old in 2025. It was reconstructed in 1951.

What condition is Ia 48 over Red Oak 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 February 2024.

How much traffic does Ia 48 over Red Oak Creek carry?

About 4,460 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Ia 48 over Red Oak Creek?

The structure is 42 ft (12.8 m) long with a longest span of 39 ft (11.9 m) and a deck 60 ft wide.

Who owns Ia 48 over Red Oak Creek?

It is owned by the State Highway Agency.