US Bridges

College DR over North Walnut Creek

Fair

Polk County, Iowa · 079253505 · Structure no. 000000000012731

Built
1987
38 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
68 ft
3 main spans
Daily traffic
1,318
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

College DR over North Walnut Creek is a concrete continuous culvert carrying College DR over North Walnut Creek in Polk County, Iowa. It was built in 1987, so it is 38 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 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 1,318 vehicles a day, projected to reach 1,318 by 2043. The structure is 68 ft (20.7 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCollege DR
CrossesNorth Walnut Creek
Location079253505
RouteCity Street 0
CountyPolk County
StateIowa
Coordinates41.60932, -93.72117
Functional classUrban Local

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length68 ft (20.7 m)
Longest span22 ft (6.7 m)
Deck width37 ft (11.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,318 (2022)
Projected traffic1,318 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$17,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was College DR over North Walnut Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is College DR over North 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 May 2023.

How much traffic does College DR over North Walnut Creek carry?

About 1,318 vehicles per day (2022 count).

How long is College DR over North Walnut Creek?

The structure is 68 ft (20.7 m) long with a longest span of 22 ft (6.7 m) and a deck 37 ft wide.

Who owns College DR over North Walnut Creek?

It is owned by the City or Municipal Highway Agency.