US Bridges

Garnet DR over Flood Channel

Fair

Story County, Iowa · A09250755 · Structure no. 000000000500770

Built
1975
50 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
78 ft
3 main spans
Daily traffic
555
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Garnet DR over Flood Channel is a concrete continuous slab carrying Garnet DR over Flood Channel in Story County, Iowa. It was built in 1975, so it is 50 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 555 vehicles a day, projected to reach 555 by 2043. The structure is 78 ft (23.8 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesGarnet DR
CrossesFlood Channel
LocationA09250755
RouteCity Street 0
CountyStory County
StateIowa
Coordinates41.98975, -93.604
Functional classUrban Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating48.4 US tons
Inventory rating29 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length78 ft (23.8 m)
Longest span29 ft (8.8 m)
Deck width39 ft (11.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic555 (2022)
Projected traffic555 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Garnet DR over Flood Channel built?

It was built in 1975, making it 50 years old in 2025.

What condition is Garnet DR over Flood Channel 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 Garnet DR over Flood Channel carry?

About 555 vehicles per day (2022 count).

How long is Garnet DR over Flood Channel?

The structure is 78 ft (23.8 m) long with a longest span of 29 ft (8.8 m) and a deck 39 ft wide.

Who owns Garnet DR over Flood Channel?

It is owned by the City or Municipal Highway Agency.