US Bridges

D-25 over Small Natural Stream

Fair

Woodbury County, Iowa · 088471508 · Structure no. 000000000053480

Built
1958
67 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
35 ft
2 main spans
Daily traffic
1,693
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

D-25 over Small Natural Stream is a concrete continuous culvert carrying D-25 over Small Natural Stream in Woodbury County, Iowa. It was built in 1958, so it is 67 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 1,693 vehicles a day, roughly 4% of them trucks, projected to reach 1,693 by 2044. The structure is 35 ft (10.7 m) long and 44 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesD-25
CrossesSmall Natural Stream
Location088471508
RouteCity Street 0
CountyWoodbury County
StateIowa
Coordinates42.44329, -96.30645
Functional classUrban 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
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 geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating96.6 US tons
Inventory rating57.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length35 ft (10.7 m)
Longest span17 ft (5.2 m)
Deck width44 ft (13.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,693 (2022)
Projected traffic1,693 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was D-25 over Small Natural Stream built?

It was built in 1958, making it 67 years old in 2025.

What condition is D-25 over Small Natural Stream 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 April 2024.

How much traffic does D-25 over Small Natural Stream carry?

About 1,693 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is D-25 over Small Natural Stream?

The structure is 35 ft (10.7 m) long with a longest span of 17 ft (5.2 m) and a deck 44 ft wide.

Who owns D-25 over Small Natural Stream?

It is owned by the City or Municipal Highway Agency.