US Bridges

County RD X-40 over Walnut Creek

Fair

Jones County, Iowa · 083031804 · Structure no. 000000000206520

Built
1960
65 years old, rebuilt 1998
Condition
Fair
inspected December 2023
Type
Slab
Concrete Continuous
Length
81 ft
3 main spans
Daily traffic
770
2022 count
Owner
County
County Highway Agency

About this bridge

County RD X-40 over Walnut Creek is a concrete continuous slab carrying County RD X-40 over Walnut Creek in Jones County, Iowa. It was built in 1960 and reconstructed in 1998, so it is 65 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 770 vehicles a day, roughly 10% of them trucks, projected to reach 770 by 2043. The structure is 81 ft (24.7 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty RD X-40
CrossesWalnut Creek
Location083031804
RouteCounty Highway 0
CountyJones County
StateIowa
Coordinates41.99983, -91.24851
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length81 ft (24.7 m)
Longest span36 ft (11 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic770 (2022)
Projected traffic770 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 County RD X-40 over Walnut Creek built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1998.

What condition is County RD X-40 over Walnut 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 December 2023.

How much traffic does County RD X-40 over Walnut Creek carry?

About 770 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is County RD X-40 over Walnut Creek?

The structure is 81 ft (24.7 m) long with a longest span of 36 ft (11 m) and a deck 31 ft wide.

Who owns County RD X-40 over Walnut Creek?

It is owned by the County Highway Agency.