US Bridges

Walnut ST 280th over Stream

Good

Delaware County, Iowa · 000000000 · Structure no. 000000000006071

Built
1997
28 years old
Condition
Good
inspected March 2023
Type
Slab
Concrete
Length
54 ft
2 main spans
Daily traffic
49
2022 count
Owner
County
County Highway Agency

About this bridge

Walnut ST 280th over Stream is a concrete slab carrying Walnut ST 280th over Stream in Delaware County, Iowa. It was built in 1997, so it is 28 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 49 vehicles a day, projected to reach 49 by 2043. The structure is 54 ft (16.5 m) long and 33 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesWalnut ST 280th
CrossesStream
Location000000000
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.33629, -91.24708
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.2 US tons
Inventory rating24.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length54 ft (16.5 m)
Longest span25 ft (7.6 m)
Deck width33 ft (10 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic49 (2022)
Projected traffic49 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Walnut ST 280th over Stream built?

It was built in 1997, making it 28 years old in 2025.

What condition is Walnut ST 280th over Stream in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does Walnut ST 280th over Stream carry?

About 49 vehicles per day (2022 count).

How long is Walnut ST 280th over Stream?

The structure is 54 ft (16.5 m) long with a longest span of 25 ft (7.6 m) and a deck 33 ft wide.

Who owns Walnut ST 280th over Stream?

It is owned by the County Highway Agency.