US Bridges

Linn-Johnson RD over Stream

Good

Johnson County, Iowa · 081080101 · Structure no. 000000000205691

Built
2001
24 years old
Condition
Good
inspected April 2023
Type
Slab
Wood or Timber
Length
24 ft
1 main span
Daily traffic
81
2021 count
Owner
County
County Highway Agency

About this bridge

Linn-Johnson RD over Stream is a wood or timber slab carrying Linn-Johnson RD over Stream in Johnson County, Iowa. It was built in 2001, so it is 24 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 81 vehicles a day, projected to reach 81 by 2043. The structure is 24 ft (7.3 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesLinn-Johnson RD
CrossesStream
Location081080101
RouteCounty Highway 0
CountyJohnson County
StateIowa
Coordinates41.86201, -91.7211
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating43.3 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 width25 ft (7.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81 (2021)
Projected traffic81 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Linn-Johnson RD over Stream built?

It was built in 2001, making it 24 years old in 2025.

What condition is Linn-Johnson RD over Stream 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 April 2023.

How much traffic does Linn-Johnson RD over Stream carry?

About 81 vehicles per day (2021 count).

How long is Linn-Johnson RD over Stream?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 25 ft wide.

Who owns Linn-Johnson RD over Stream?

It is owned by the County Highway Agency.