US Bridges

NW Madrid DR over Big Creek Tributary

Fair

Polk County, Iowa · 081253504 · Structure no. 000000000283308

Built
1970
55 years old
Condition
Fair
inspected September 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
445 ft
3 main spans
Daily traffic
1,340
2022 count
Owner
County
County Highway Agency

About this bridge

NW Madrid DR over Big Creek Tributary is a steel continuous girder and floorbeam system carrying NW Madrid DR over Big Creek Tributary in Polk County, Iowa. It was built in 1970, so it is 55 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 1,340 vehicles a day, roughly 2% of them trucks, projected to reach 1,340 by 2042. The structure is 445 ft (135.6 m) long and 32 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesNW Madrid DR
CrossesBig Creek Tributary
Location081253504
RouteCounty Highway 0
CountyPolk County
StateIowa
Coordinates41.79194, -93.73419
Functional classRural Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 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 alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating30.8 US tons
Inventory rating23.6 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length445 ft (135.6 m)
Longest span171 ft (52.1 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,340 (2022)
Projected traffic1,340 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 NW Madrid DR over Big Creek Tributary built?

It was built in 1970, making it 55 years old in 2025.

What condition is NW Madrid DR over Big Creek Tributary 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 September 2023.

How much traffic does NW Madrid DR over Big Creek Tributary carry?

About 1,340 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is NW Madrid DR over Big Creek Tributary?

The structure is 445 ft (135.6 m) long with a longest span of 171 ft (52.1 m) and a deck 32 ft wide.

Who owns NW Madrid DR over Big Creek Tributary?

It is owned by the County Highway Agency.