US Bridges

Main RD over Trib to Rock Creek

Fair

Black Hawk County, Iowa · 87-11-32-05-10 · Structure no. 000000000073900

Built
1974
51 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
24 ft
2 main spans
Daily traffic
69
2022 count
Owner
County
County Highway Agency

About this bridge

Main RD over Trib to Rock Creek is a concrete continuous culvert carrying Main RD over Trib to Rock Creek in Black Hawk County, Iowa. It was built in 1974, so it is 51 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 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 69 vehicles a day, projected to reach 69 by 2043. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMain RD
CrossesTrib to Rock Creek
Location87-11-32-05-10
RouteCounty Highway 0
CountyBlack Hawk County
StateIowa
Coordinates42.29796, -92.15535
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating49.5 US tons
Inventory rating29.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length24 ft (7.3 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic69 (2022)
Projected traffic69 by 2043
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 Main RD over Trib to Rock Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is Main RD over Trib to Rock 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 November 2023.

How much traffic does Main RD over Trib to Rock Creek carry?

About 69 vehicles per day (2022 count).

How long is Main RD over Trib to Rock Creek?

The structure is 24 ft (7.3 m) long with a longest span of 12 ft (3.7 m).

Who owns Main RD over Trib to Rock Creek?

It is owned by the County Highway Agency.