US Bridges

S 12th Ave W over Small Stream

PoorPosted for load

Jasper County, Iowa · 079210601 · Structure no. 000000000197340

Built
1926
99 years old
Condition
Poor
inspected April 2023
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
150
2022 count
Owner
County
County Highway Agency

About this bridge

S 12th Ave W over Small Stream is a concrete slab carrying S 12th Ave W over Small Stream in Jasper County, Iowa. It was built in 1926, so it is 99 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 150 vehicles a day, roughly 9% of them trucks, projected to reach 150 by 2043. The structure is 22 ft (6.7 m) long and 20 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesS 12th Ave W
CrossesSmall Stream
Location079210601
RouteCounty Highway 0
CountyJasper County
StateIowa
Coordinates41.68844, -93.3373
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating35.2 US tons
Inventory rating13.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2022)
Projected traffic150 by 2043
Trucks9%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S 12th Ave W over Small Stream built?

It was built in 1926, making it 99 years old in 2025.

What condition is S 12th Ave W over Small Stream in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2023.

How much traffic does S 12th Ave W over Small Stream carry?

About 150 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is S 12th Ave W over Small Stream?

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

Who owns S 12th Ave W over Small Stream?

It is owned by the County Highway Agency.