US Bridges

NW 100th ST NB over I 35 & I 80

Good

Polk County, Iowa · 1.0 Mi. E of Jct. 141 · Structure no. 000000000041381

Built
2016
9 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
333 ft
2 main spans
Daily traffic
2,620
2022 count
Owner
State
State Highway Agency

About this bridge

NW 100th ST NB over I 35 & I 80 is a steel continuous stringer/multi-beam or girder carrying NW 100th ST NB over I 35 & I 80 in Polk County, Iowa. It was built in 2016, so it is 9 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,620 vehicles a day, roughly 2% of them trucks, projected to reach 2,620 by 2044. The structure is 333 ft (101.6 m) long and 67 ft wide.

CarriesNW 100th ST NB
CrossesI 35 & I 80
Location1.0 Mi. E of Jct. 141
RouteCity Street 0
StateIowa
Coordinates41.65132, -93.75586
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length333 ft (101.6 m)
Longest span165 ft (50.3 m)
Deck width67 ft (20.4 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,620 (2022)
Projected traffic2,620 by 2044
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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 NW 100th ST NB over I 35 & I 80 built?

It was built in 2016, making it 9 years old in 2025.

What condition is NW 100th ST NB over I 35 & I 80 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 May 2024.

How much traffic does NW 100th ST NB over I 35 & I 80 carry?

About 2,620 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is NW 100th ST NB over I 35 & I 80?

The structure is 333 ft (101.6 m) long with a longest span of 165 ft (50.3 m) and a deck 67 ft wide.

Who owns NW 100th ST NB over I 35 & I 80?

It is owned by the State Highway Agency.