US Bridges

NW Ramp over Poyner Creek

Good

Black Hawk County, Iowa · At Jct. S.R. V49 · Structure no. 000000000605200

Built
1983
42 years old
Condition
Good
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
150 ft
3 main spans
Daily traffic
1,370
2022 count
Owner
State
State Highway Agency

About this bridge

NW Ramp over Poyner Creek is a prestressed concrete stringer/multi-beam or girder carrying NW Ramp over Poyner Creek in Black Hawk County, Iowa. It was built in 1983, so it is 42 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 1,370 vehicles a day, roughly 8% of them trucks, projected to reach 1,370 by 2043. The structure is 150 ft (45.7 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNW Ramp
CrossesPoyner Creek
LocationAt Jct. S.R. V49
RouteInterstate 380
StateIowa
Coordinates42.45038, -92.22282
Functional classUrban Principal Arterial - Interstate

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating65.1 US tons
Inventory rating34.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span52 ft (15.9 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,370 (2022)
Projected traffic1,370 by 2043
Trucks8%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 NW Ramp over Poyner Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is NW Ramp over Poyner 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 January 2023.

How much traffic does NW Ramp over Poyner Creek carry?

About 1,370 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is NW Ramp over Poyner Creek?

The structure is 150 ft (45.7 m) long with a longest span of 52 ft (15.9 m) and a deck 29 ft wide.

Who owns NW Ramp over Poyner Creek?

It is owned by the State Highway Agency.