US Bridges

240th ST over Maquoketa River

Good

Delaware County, Iowa · 00000 · Structure no. 000000000140921

Built
2011
14 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
359 ft
3 main spans
Daily traffic
1,080
2022 count
Owner
County
County Highway Agency

About this bridge

240th ST over Maquoketa River is a prestressed concrete continuous stringer/multi-beam or girder carrying 240th ST over Maquoketa River in Delaware County, Iowa. It was built in 2011, so it is 14 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,080 vehicles a day, projected to reach 1,080 by 2044. The structure is 359 ft (109.4 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
Carries240th ST
CrossesMaquoketa River
Location00000
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.44052, -91.4078
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length359 ft (109.4 m)
Longest span127 ft (38.7 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,080 (2022)
Projected traffic1,080 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 240th ST over Maquoketa River built?

It was built in 2011, making it 14 years old in 2025.

What condition is 240th ST over Maquoketa River 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 February 2024.

How much traffic does 240th ST over Maquoketa River carry?

About 1,080 vehicles per day (2022 count).

How long is 240th ST over Maquoketa River?

The structure is 359 ft (109.4 m) long with a longest span of 127 ft (38.7 m) and a deck 33 ft wide.

Who owns 240th ST over Maquoketa River?

It is owned by the County Highway Agency.