US Bridges

NB US 218 over Black Hawk Ck & RD

Fair

Black Hawk County, Iowa · 0.2 Mi. N of Jct. U.S. 63 · Structure no. 000000000601030

Built
1991
34 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
897 ft
12 main spans
Daily traffic
11,250
2022 count
Owner
State
State Highway Agency

About this bridge

NB US 218 over Black Hawk Ck & RD is a prestressed concrete stringer/multi-beam or girder carrying NB US 218 over Black Hawk Ck & RD in Black Hawk County, Iowa. It was built in 1991, so it is 34 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 11,250 vehicles a day, roughly 11% of them trucks, projected to reach 11,250 by 2044. The structure is 897 ft (273.4 m) long and 72 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB US 218
CrossesBlack Hawk Ck & RD
Location0.2 Mi. N of Jct. U.S. 63
RouteU.S. Route 218
CountyBlack Hawk County
StateIowa
Coordinates42.49834, -92.35939
Functional classUrban Other Principal Arterial

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 protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.5 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans12
Design loadHS 20
Structure length897 ft (273.4 m)
Longest span92 ft (28 m)
Deck width72 ft (21.9 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,250 (2022)
Projected traffic11,250 by 2044
Trucks11%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 NB US 218 over Black Hawk Ck & RD built?

It was built in 1991, making it 34 years old in 2025.

What condition is NB US 218 over Black Hawk Ck & RD 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 NB US 218 over Black Hawk Ck & RD carry?

About 11,250 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is NB US 218 over Black Hawk Ck & RD?

The structure is 897 ft (273.4 m) long with a longest span of 92 ft (28 m) and a deck 72 ft wide.

Who owns NB US 218 over Black Hawk Ck & RD?

It is owned by the State Highway Agency.