US Bridges

FM 230th Ave over Maquoketa River

FairClosed to traffic

Delaware County, Iowa · 088042902 · Structure no. 000000000140800

Built
1934
91 years old, rebuilt 1990
Condition
Fair
inspected October 2014
Type
Slab
Concrete Continuous
Length
147 ft
6 main spans
Daily traffic
108
2022 count
Owner
County
County Highway Agency

About this bridge

FM 230th Ave over Maquoketa River is a concrete continuous slab carrying FM 230th Ave over Maquoketa River in Delaware County, Iowa. It was built in 1934 and reconstructed in 1990, so it is 91 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: closed to all traffic.

It carries about 108 vehicles a day, roughly 14% of them trucks, projected to reach 108 by 2043. The structure is 147 ft (44.8 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFM 230th Ave
CrossesMaquoketa River
Location088042902
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.4079, -91.34531
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection0 FailedOut of service and beyond corrective action.
Last inspectionOctober 2014
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length147 ft (44.8 m)
Longest span25 ft (7.6 m)
Deck width25 ft (7.6 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic108 (2022)
Projected traffic108 by 2043
Trucks14%
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM 230th Ave over Maquoketa River built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1990.

What condition is FM 230th Ave over Maquoketa River 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 2014.

How much traffic does FM 230th Ave over Maquoketa River carry?

About 108 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is FM 230th Ave over Maquoketa River?

The structure is 147 ft (44.8 m) long with a longest span of 25 ft (7.6 m) and a deck 25 ft wide.

Who owns FM 230th Ave over Maquoketa River?

It is owned by the County Highway Agency.