US Bridges

Local 185 ST over Plum Creek

Fair

Delaware County, Iowa · 089041603 · Structure no. 000000000141561

Built
1986
39 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Prestressed Concrete
Length
72 ft
2 main spans
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

Local 185 ST over Plum Creek is a prestressed concrete tee beam carrying Local 185 ST over Plum Creek in Delaware County, Iowa. It was built in 1986, so it is 39 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 20 vehicles a day, projected to reach 20 by 2044. The structure is 72 ft (21.9 m) long and 25 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesLocal 185 ST
CrossesPlum Creek
Location089041603
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.52123, -91.31448
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.1 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span33 ft (10.1 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Local 185 ST over Plum Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is Local 185 ST over Plum 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 2024.

How much traffic does Local 185 ST over Plum Creek carry?

About 20 vehicles per day (2022 count).

How long is Local 185 ST over Plum Creek?

The structure is 72 ft (21.9 m) long with a longest span of 33 ft (10.1 m) and a deck 25 ft wide.

Who owns Local 185 ST over Plum Creek?

It is owned by the County Highway Agency.