US Bridges

Swan Lake RD NE over Stream

Fair

Johnson County, Iowa · 080070503 · Structure no. 000000000204981

Built
1973
52 years old
Condition
Fair
inspected April 2021
Type
Stringer/Multi-beam or Girder
Concrete
Length
38 ft
1 main span
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

Swan Lake RD NE over Stream is a concrete stringer/multi-beam or girder carrying Swan Lake RD NE over Stream in Johnson County, Iowa. It was built in 1973, so it is 52 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 100 vehicles a day, projected to reach 100 by 2043. The structure is 38 ft (11.6 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesSwan Lake RD NE
CrossesStream
Location080070503
RouteCounty Highway 0
CountyJohnson County
StateIowa
Coordinates41.77478, -91.69094
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2021
Inspection intervalevery 48 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 rating58.5 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span38 ft (11.6 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic100 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 NE over Stream built?

It was built in 1973, making it 52 years old in 2025.

What condition is Swan Lake RD NE over Stream 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 2021.

How much traffic does Swan Lake RD NE over Stream carry?

About 100 vehicles per day (2022 count).

How long is Swan Lake RD NE over Stream?

The structure is 38 ft (11.6 m) long with a longest span of 38 ft (11.6 m) and a deck 26 ft wide.

Who owns Swan Lake RD NE over Stream?

It is owned by the County Highway Agency.