US Bridges

FM over Rock Creek Lake

Fair

Jasper County, Iowa · 080170403 · Structure no. 000000000197541

Built
1979
46 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
128 ft
3 main spans
Daily traffic
360
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Rock Creek Lake is a concrete continuous slab carrying FM over Rock Creek Lake in Jasper County, Iowa. It was built in 1979, so it is 46 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.

It carries about 360 vehicles a day, roughly 14% of them trucks, projected to reach 360 by 2044. The structure is 128 ft (39 m) long and 45 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesFM
CrossesRock Creek Lake
Location080170403
RouteCounty Highway 0
CountyJasper County
StateIowa
Coordinates41.76158, -92.84163
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
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating56 US tons
Inventory rating32.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length128 ft (39 m)
Longest span49 ft (14.9 m)
Deck width45 ft (13.7 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic360 (2022)
Projected traffic360 by 2044
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 over Rock Creek Lake built?

It was built in 1979, making it 46 years old in 2025.

What condition is FM over Rock Creek Lake 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 2024.

How much traffic does FM over Rock Creek Lake carry?

About 360 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is FM over Rock Creek Lake?

The structure is 128 ft (39 m) long with a longest span of 49 ft (14.9 m) and a deck 45 ft wide.

Who owns FM over Rock Creek Lake?

It is owned by the County Highway Agency.