US Bridges

255th Ave over Plum Creek

Good

Delaware County, Iowa · 089 04 15 06 · Structure no. 000000000141551

Built
2013
12 years old
Condition
Good
inspected November 2024
Type
Slab
Concrete Continuous
Length
103 ft
3 main spans
Daily traffic
29
2022 count
Owner
County
County Highway Agency

About this bridge

255th Ave over Plum Creek is a concrete continuous slab carrying 255th Ave over Plum Creek in Delaware County, Iowa. It was built in 2013, so it is 12 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 29 vehicles a day, projected to reach 29 by 2044. The structure is 103 ft (31.4 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries255th Ave
CrossesPlum Creek
Location089 04 15 06
RouteCounty Highway 0
StateIowa
Coordinates42.52088, -91.30737
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.1 US tons
Inventory rating44.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length103 ft (31.4 m)
Longest span39 ft (11.9 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29 (2022)
Projected traffic29 by 2044
Trucks0%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 255th Ave over Plum Creek built?

It was built in 2013, making it 12 years old in 2025.

What condition is 255th Ave over Plum Creek 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 November 2024.

How much traffic does 255th Ave over Plum Creek carry?

About 29 vehicles per day (2022 count).

How long is 255th Ave over Plum Creek?

The structure is 103 ft (31.4 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.

Who owns 255th Ave over Plum Creek?

It is owned by the County Highway Agency.