US Bridges

NB Ia 27 over Waterloo RD

Good

Black Hawk County, Iowa · 1.3 Mi. S of Jct. US 218 · Structure no. 000000000601525

Built
1995
30 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
215 ft
3 main spans
Daily traffic
7,550
2022 count
Owner
State
State Highway Agency

About this bridge

NB Ia 27 over Waterloo RD is a prestressed concrete stringer/multi-beam or girder carrying NB Ia 27 over Waterloo RD in Black Hawk County, Iowa. It was built in 1995, so it is 30 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 7,550 vehicles a day, roughly 7% of them trucks, projected to reach 7,550 by 2042. The structure is 215 ft (65.5 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNB Ia 27
CrossesWaterloo RD
Location1.3 Mi. S of Jct. US 218
RouteState Highway 27
CountyBlack Hawk County
StateIowa
Coordinates42.52392, -92.44038
Functional classUrban Other Principal Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99.8 US tons
Inventory rating51.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length215 ft (65.5 m)
Longest span106 ft (32.3 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,550 (2022)
Projected traffic7,550 by 2042
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NB Ia 27 over Waterloo RD built?

It was built in 1995, making it 30 years old in 2025.

What condition is NB Ia 27 over Waterloo RD 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 June 2023.

How much traffic does NB Ia 27 over Waterloo RD carry?

About 7,550 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is NB Ia 27 over Waterloo RD?

The structure is 215 ft (65.5 m) long with a longest span of 106 ft (32.3 m) and a deck 43 ft wide.

Who owns NB Ia 27 over Waterloo RD?

It is owned by the State Highway Agency.