US Bridges

Oak RD over Stream

Fair

Delaware County, Iowa · 090041603 · Structure no. 000000000142351

Built
1978
47 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
59
2022 count
Owner
County
County Highway Agency

About this bridge

Oak RD over Stream is a prestressed concrete tee beam carrying Oak RD over Stream in Delaware County, Iowa. It was built in 1978, so it is 47 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 59 vehicles a day, projected to reach 59 by 2044. The structure is 46 ft (14 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesOak RD
CrossesStream
Location090041603
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.60899, -91.31477
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment6: Equal to present minimum criteria
Operating rating41.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span45 ft (13.7 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic59 (2022)
Projected traffic59 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 Oak RD over Stream built?

It was built in 1978, making it 47 years old in 2025.

What condition is Oak RD over 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 October 2024.

How much traffic does Oak RD over Stream carry?

About 59 vehicles per day (2022 count).

How long is Oak RD over Stream?

The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 24 ft wide.

Who owns Oak RD over Stream?

It is owned by the County Highway Agency.