US Bridges

R 30 (w Ave) over Walnut Creek

Fair

Dallas County, Iowa · 079261104 · Structure no. 000000000131560

Built
1975
50 years old
Condition
Fair
inspected November 2021
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
3,018
2022 count
Owner
County
County Highway Agency

About this bridge

R 30 (w Ave) over Walnut Creek is a concrete continuous culvert carrying R 30 (w Ave) over Walnut Creek in Dallas County, Iowa. It was built in 1975, so it is 50 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 6 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 3,018 vehicles a day, roughly 10% of them trucks, projected to reach 3,018 by 2042. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesR 30 (w Ave)
CrossesWalnut Creek
Location079261104
RouteCounty Highway 0
CountyDallas County
StateIowa
Coordinates41.66221, -93.85283
Functional classRural Minor 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,018 (2022)
Projected traffic3,018 by 2042
Trucks10%
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 statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was R 30 (w Ave) over Walnut Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is R 30 (w Ave) 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 November 2021.

How much traffic does R 30 (w Ave) over Walnut Creek carry?

About 3,018 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is R 30 (w Ave) over Walnut Creek?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).

Who owns R 30 (w Ave) over Walnut Creek?

It is owned by the County Highway Agency.