US Bridges

King RD over Rock Creek

Good

Black Hawk County, Iowa · 87-11-33-02-10 · Structure no. 000000000073911

Built
2020
5 years old
Condition
Good
inspected November 2023
Type
Slab
Concrete Continuous
Length
90 ft
3 main spans
Daily traffic
70
2022 count
Owner
County
County Highway Agency

About this bridge

King RD over Rock Creek is a concrete continuous slab carrying King RD over Rock Creek in Black Hawk County, Iowa. It was built in 2020, so it is 5 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 70 vehicles a day, projected to reach 70 by 2043. The structure is 90 ft (27.4 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesKing RD
CrossesRock Creek
Location87-11-33-02-10
RouteCounty Highway 0
CountyBlack Hawk County
StateIowa
Coordinates42.30395, -92.14258
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating55.7 US tons
Inventory rating42.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length90 ft (27.4 m)
Longest span35 ft (10.7 m)
Deck width33 ft (10.2 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2022)
Projected traffic70 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 King RD over Rock Creek built?

It was built in 2020, making it 5 years old in 2025.

What condition is King RD over Rock Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does King RD over Rock Creek carry?

About 70 vehicles per day (2022 count).

How long is King RD over Rock Creek?

The structure is 90 ft (27.4 m) long with a longest span of 35 ft (10.7 m) and a deck 33 ft wide.

Who owns King RD over Rock Creek?

It is owned by the County Highway Agency.