US Bridges

310th Street over Middle Mill Creek

Fair

Page County, Iowa · 067372901 · Structure no. 000000000039081

Built
1980
45 years old
Condition
Fair
inspected October 2022
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
309
2022 count
Owner
County
County Highway Agency

About this bridge

310th Street over Middle Mill Creek is a concrete continuous culvert carrying 310th Street over Middle Mill Creek in Page County, Iowa. It was built in 1980, so it is 45 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 309 vehicles a day, roughly 15% of them trucks, projected to reach 309 by 2042. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Carries310th Street
CrossesMiddle Mill Creek
Location067372901
RouteCounty Highway 0
StateIowa
Coordinates40.595, -95.11702
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic309 (2022)
Projected traffic309 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 310th Street over Middle Mill Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is 310th Street over Middle Mill Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2022.

How much traffic does 310th Street over Middle Mill Creek carry?

About 309 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is 310th Street over Middle Mill Creek?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns 310th Street over Middle Mill Creek?

It is owned by the County Highway Agency.