US Bridges

Dysart RD over Trib to Miller Creek

Fair

Black Hawk County, Iowa · 87-12-06-02-10 · Structure no. 000000000074021

Built
1994
31 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
103 ft
3 main spans
Daily traffic
1,660
2022 count
Owner
County
County Highway Agency

About this bridge

Dysart RD over Trib to Miller Creek is a concrete continuous slab carrying Dysart RD over Trib to Miller Creek in Black Hawk County, Iowa. It was built in 1994, so it is 31 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 1,660 vehicles a day, projected to reach 1,660 by 2043. The structure is 103 ft (31.4 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesDysart RD
CrossesTrib to Miller Creek
Location87-12-06-02-10
RouteCounty Highway 0
CountyBlack Hawk County
StateIowa
Coordinates42.37016, -92.29864
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
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
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating88.5 US tons
Inventory rating53.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length103 ft (31.4 m)
Longest span39 ft (11.9 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,660 (2022)
Projected traffic1,660 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Dysart RD over Trib to Miller Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is Dysart RD over Trib to Miller 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 Dysart RD over Trib to Miller Creek carry?

About 1,660 vehicles per day (2022 count).

How long is Dysart RD over Trib to Miller 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 Dysart RD over Trib to Miller Creek?

It is owned by the County Highway Agency.