US Bridges

322 Avenue over Mill Creek

Poor

Fremont County, Iowa · 068413204 · Structure no. 000000000159410

Built
1957
68 years old
Condition
Poor
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
111 ft
3 main spans
Daily traffic
26
2021 count
Owner
County
County Highway Agency

About this bridge

322 Avenue over Mill Creek is a steel stringer/multi-beam or girder carrying 322 Avenue over Mill Creek in Fremont County, Iowa. It was built in 1957, so it is 68 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 26 vehicles a day, projected to reach 26 by 2043. The structure is 111 ft (33.8 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Carries322 Avenue
CrossesMill Creek
Location068413204
RouteCounty Highway 0
StateIowa
Coordinates40.65843, -95.57837
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
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
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating23.1 US tons
Inventory rating17 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans3
Design loadUnknown
Structure length111 ft (33.8 m)
Longest span42 ft (12.8 m)
Deck width22 ft (6.7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2021)
Projected traffic26 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 322 Avenue over Mill Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is 322 Avenue over Mill Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.

How much traffic does 322 Avenue over Mill Creek carry?

About 26 vehicles per day (2021 count).

How long is 322 Avenue over Mill Creek?

The structure is 111 ft (33.8 m) long with a longest span of 42 ft (12.8 m) and a deck 22 ft wide.

Who owns 322 Avenue over Mill Creek?

It is owned by the County Highway Agency.