US Bridges

250th Ave over Black Creek

Fair

Clinton County, Iowa · 082E32702 · Structure no. 000000000123591

Built
1985
40 years old
Condition
Fair
inspected February 2024
Type
Tee Beam
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

250th Ave over Black Creek is a prestressed concrete tee beam carrying 250th Ave over Black Creek in Clinton County, Iowa. It was built in 1985, so it is 40 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 11 vehicles a day, projected to reach 11 by 2044. The structure is 42 ft (12.8 m) long and 20 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries250th Ave
CrossesBlack Creek
Location082E32702
RouteCounty Highway 0
CountyClinton County
StateIowa
Coordinates41.88736, -90.60683
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating58.4 US tons
Inventory rating34.9 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length42 ft (12.8 m)
Longest span40 ft (12.2 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2022)
Projected traffic11 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 250th Ave over Black Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is 250th Ave over Black 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 February 2024.

How much traffic does 250th Ave over Black Creek carry?

About 11 vehicles per day (2022 count).

How long is 250th Ave over Black Creek?

The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 20 ft wide.

Who owns 250th Ave over Black Creek?

It is owned by the County Highway Agency.