US Bridges

FM 1400 310th over Drainage Ditch 1&2

Fair

Hancock County, Iowa · 097242001 · Structure no. 000000000174161

Built
1974
51 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
478
2021 count
Owner
County
County Highway Agency

About this bridge

FM 1400 310th over Drainage Ditch 1&2 is a concrete continuous culvert carrying FM 1400 310th over Drainage Ditch 1&2 in Hancock County, Iowa. It was built in 1974, so it is 51 years old, older 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 6 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 478 vehicles a day, roughly 15% of them trucks, projected to reach 478 by 2043. The structure is 31 ft (9.4 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesFM 1400 310th
CrossesDrainage Ditch 1&2
Location097242001
RouteCounty Highway 0
CountyHancock County
StateIowa
Coordinates43.21282, -93.71492
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating54 US tons
Inventory rating32.4 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length31 ft (9.4 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic478 (2021)
Projected traffic478 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 FM 1400 310th over Drainage Ditch 1&2 built?

It was built in 1974, making it 51 years old in 2025.

What condition is FM 1400 310th over Drainage Ditch 1&2 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 April 2023.

How much traffic does FM 1400 310th over Drainage Ditch 1&2 carry?

About 478 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is FM 1400 310th over Drainage Ditch 1&2?

The structure is 31 ft (9.4 m) long with a longest span of 15 ft (4.6 m).

Who owns FM 1400 310th over Drainage Ditch 1&2?

It is owned by the County Highway Agency.