US Bridges

Jefferson ST over Ralston Creek

Fair

Johnson County, Iowa · 079061100 · Structure no. 000000000006320

Built
1958
67 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
1,802
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Jefferson ST over Ralston Creek is a concrete slab carrying Jefferson ST over Ralston Creek in Johnson County, Iowa. It was built in 1958, so it is 67 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 5 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 1,802 vehicles a day, projected to reach 1,802 by 2043. The structure is 22 ft (6.7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesJefferson ST
CrossesRalston Creek
Location079061100
RouteCity Street 0
CountyJohnson County
StateIowa
Coordinates41.66184, -91.51511
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.3 US tons
Inventory rating34.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width43 ft (13 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,802 (2022)
Projected traffic1,802 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$28,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Jefferson ST over Ralston Creek built?

It was built in 1958, making it 67 years old in 2025.

What condition is Jefferson ST over Ralston Creek 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 June 2023.

How much traffic does Jefferson ST over Ralston Creek carry?

About 1,802 vehicles per day (2022 count).

How long is Jefferson ST over Ralston Creek?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 43 ft wide.

Who owns Jefferson ST over Ralston Creek?

It is owned by the City or Municipal Highway Agency.