US Bridges

Linn-Benton RD over Little Gannon Ck

Fair

Linn County, Iowa · 084083004 · Structure no. 000000000221821

Built
1992
33 years old
Condition
Fair
inspected August 2024
Type
Slab
Wood or Timber
Length
24 ft
1 main span
Daily traffic
88
2022 count
Owner
County
County Highway Agency

About this bridge

Linn-Benton RD over Little Gannon Ck is a wood or timber slab carrying Linn-Benton RD over Little Gannon Ck in Linn County, Iowa. It was built in 1992, so it is 33 years old, younger 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 88 vehicles a day, projected to reach 88 by 2044. The structure is 24 ft (7.3 m) long and 24 ft wide.

CarriesLinn-Benton RD
CrossesLittle Gannon Ck
Location084083004
RouteCounty Highway 0
StateIowa
Coordinates42.05354, -91.83507
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.3 US tons
Inventory rating63.8 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic88 (2022)
Projected traffic88 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Linn-Benton RD over Little Gannon Ck built?

It was built in 1992, making it 33 years old in 2025.

What condition is Linn-Benton RD over Little Gannon Ck 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 August 2024.

How much traffic does Linn-Benton RD over Little Gannon Ck carry?

About 88 vehicles per day (2022 count).

How long is Linn-Benton RD over Little Gannon Ck?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 24 ft wide.

Who owns Linn-Benton RD over Little Gannon Ck?

It is owned by the County Highway Agency.