US Bridges

FM Rockville RD over Maquoketa River

FairPosted for load

Delaware County, Iowa · 088032403 · Structure no. 000000000140530

Built
1953
72 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
200 ft
3 main spans
Daily traffic
118
2022 count
Owner
County
County Highway Agency

About this bridge

FM Rockville RD over Maquoketa River is a steel continuous stringer/multi-beam or girder carrying FM Rockville RD over Maquoketa River in Delaware County, Iowa. It was built in 1953, so it is 72 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: posted for load restriction.

It carries about 118 vehicles a day, projected to reach 118 by 2044. The structure is 200 ft (61 m) long and 22 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesFM Rockville RD
CrossesMaquoketa River
Location088032403
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.41858, -91.13941
Functional classRural Minor 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
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length200 ft (61 m)
Longest span78 ft (23.8 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic118 (2022)
Projected traffic118 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$290,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FM Rockville RD over Maquoketa River built?

It was built in 1953, making it 72 years old in 2025.

What condition is FM Rockville RD 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 January 2024.

How much traffic does FM Rockville RD over Maquoketa River carry?

About 118 vehicles per day (2022 count).

How long is FM Rockville RD over Maquoketa River?

The structure is 200 ft (61 m) long with a longest span of 78 ft (23.8 m) and a deck 22 ft wide.

Who owns FM Rockville RD over Maquoketa River?

It is owned by the County Highway Agency.