US Bridges

Swan Lake RD over Br Iowa River

Good

Johnson County, Iowa · T80N R07W 3 · Structure no. 000000000204971

Built
2018
7 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete Continuous
Length
84 ft
3 main spans
Daily traffic
131
2022 count
Owner
County
County Highway Agency

About this bridge

Swan Lake RD over Br Iowa River is a concrete continuous slab carrying Swan Lake RD over Br Iowa River in Johnson County, Iowa. It was built in 2018, so it is 7 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 131 vehicles a day, projected to reach 131 by 2044. The structure is 84 ft (25.5 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSwan Lake RD
CrossesBr Iowa River
LocationT80N R07W 3
RouteCounty Highway 0
StateIowa
Coordinates41.77497, -91.65284
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.1 US tons
Inventory rating45 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length84 ft (25.5 m)
Longest span31 ft (9.4 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic131 (2022)
Projected traffic131 by 2044
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 Swan Lake RD over Br Iowa River built?

It was built in 2018, making it 7 years old in 2025.

What condition is Swan Lake RD over Br Iowa River 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 August 2024.

How much traffic does Swan Lake RD over Br Iowa River carry?

About 131 vehicles per day (2022 count).

How long is Swan Lake RD over Br Iowa River?

The structure is 84 ft (25.5 m) long with a longest span of 31 ft (9.4 m) and a deck 33 ft wide.

Who owns Swan Lake RD over Br Iowa River?

It is owned by the County Highway Agency.