US Bridges

I29 NB Off Ramp over Perry Creek Conduit

Good

Woodbury County, Iowa · 0.1 MI S of JCT US 77 · Structure no. 000000000604021

Built
2017
8 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
94 ft
1 main span
Daily traffic
91,000
2022 count
Owner
State
State Highway Agency

About this bridge

I29 NB Off Ramp over Perry Creek Conduit is a prestressed concrete stringer/multi-beam or girder carrying I29 NB Off Ramp over Perry Creek Conduit in Woodbury County, Iowa. It was built in 2017, so it is 8 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 91,000 vehicles a day, projected to reach 91,000 by 2043. The structure is 94 ft (28.5 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI29 NB Off Ramp
CrossesPerry Creek Conduit
Location0.1 MI S of JCT US 77
RouteInterstate 29
CountyWoodbury County
StateIowa
Coordinates42.49129, -96.41092
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation8: Equal to present desirable criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length94 ft (28.5 m)
Longest span90 ft (27.4 m)
Deck width52 ft (15.8 m)
Roadway width49 ft (14.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic91,000 (2022)
Projected traffic91,000 by 2043
Trucks0%
Lanes on structure3
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 I29 NB Off Ramp over Perry Creek Conduit built?

It was built in 2017, making it 8 years old in 2025.

What condition is I29 NB Off Ramp over Perry Creek Conduit 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 December 2023.

How much traffic does I29 NB Off Ramp over Perry Creek Conduit carry?

About 91,000 vehicles per day (2022 count).

How long is I29 NB Off Ramp over Perry Creek Conduit?

The structure is 94 ft (28.5 m) long with a longest span of 90 ft (27.4 m) and a deck 52 ft wide.

Who owns I29 NB Off Ramp over Perry Creek Conduit?

It is owned by the State Highway Agency.