US Bridges

11th ST over Lateral #77 Dd #23

Fair

Carroll County, Iowa · 000000000 · Structure no. 000000000503710

Built
1900
125 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete Continuous
Length
20 ft
2 main spans
Daily traffic
1,112
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

11th ST over Lateral #77 Dd #23 is a concrete continuous culvert carrying 11th ST over Lateral #77 Dd #23 in Carroll County, Iowa. It was built in 1900, so it is 125 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 1,112 vehicles a day, projected to reach 1,112 by 2043. The structure is 20 ft (6.1 m) long.

Location

Open in Google Maps
Carries11th ST
CrossesLateral #77 Dd #23
Location000000000
RouteCity Street 0
CountyCarroll County
StateIowa
Coordinates42.06952, -94.85949
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.9 US tons
Inventory rating41.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length20 ft (6.1 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,112 (2022)
Projected traffic1,112 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
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$65,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 11th ST over Lateral #77 Dd #23 built?

It was built in 1900, making it 125 years old in 2025.

What condition is 11th ST over Lateral #77 Dd #23 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 October 2023.

How much traffic does 11th ST over Lateral #77 Dd #23 carry?

About 1,112 vehicles per day (2022 count).

How long is 11th ST over Lateral #77 Dd #23?

The structure is 20 ft (6.1 m) long with a longest span of 10 ft (3 m).

Who owns 11th ST over Lateral #77 Dd #23?

It is owned by the City or Municipal Highway Agency.