US Bridges

FM over Walnut Creek

Poor

Scott County, Iowa · 080E11208 · Structure no. 000000000303091

Built
1949
76 years old, rebuilt 1987
Condition
Poor
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
104 ft
3 main spans
Daily traffic
1,060
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Walnut Creek is a steel stringer/multi-beam or girder carrying FM over Walnut Creek in Scott County, Iowa. It was built in 1949 and reconstructed in 1987, so it is 76 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,060 vehicles a day, roughly 13% of them trucks, projected to reach 1,060 by 2043. The structure is 104 ft (31.7 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFM
CrossesWalnut Creek
Location080E11208
RouteCounty Highway 0
CountyScott County
StateIowa
Coordinates41.74558, -90.78651
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating60.5 US tons
Inventory rating38.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length104 ft (31.7 m)
Longest span34 ft (10.4 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,060 (2022)
Projected traffic1,060 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Walnut Creek built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1987.

What condition is FM over Walnut Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2023.

How much traffic does FM over Walnut Creek carry?

About 1,060 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is FM over Walnut Creek?

The structure is 104 ft (31.7 m) long with a longest span of 34 ft (10.4 m) and a deck 31 ft wide.

Who owns FM over Walnut Creek?

It is owned by the County Highway Agency.