US Bridges

350 Avenue over Mill Creek

Good

Fremont County, Iowa · 067411402 · Structure no. 000000000158961

Built
1987
38 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
142 ft
3 main spans
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

350 Avenue over Mill Creek is a prestressed concrete stringer/multi-beam or girder carrying 350 Avenue over Mill Creek in Fremont County, Iowa. It was built in 1987, so it is 38 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 15 vehicles a day, roughly 20% of them trucks, projected to reach 15 by 2043. The structure is 142 ft (43.3 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Carries350 Avenue
CrossesMill Creek
Location067411402
RouteCounty Highway 0
StateIowa
Coordinates40.62511, -95.52644
Functional classRural Local

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.5 US tons
Inventory rating40.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length142 ft (43.3 m)
Longest span52 ft (15.9 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2022)
Projected traffic15 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 350 Avenue over Mill Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is 350 Avenue over Mill 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 May 2023.

How much traffic does 350 Avenue over Mill Creek carry?

About 15 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is 350 Avenue over Mill Creek?

The structure is 142 ft (43.3 m) long with a longest span of 52 ft (15.9 m) and a deck 27 ft wide.

Who owns 350 Avenue over Mill Creek?

It is owned by the County Highway Agency.