Local over Dd 175

FairPosted for load

Palo Alto County, Iowa · 095331801 · Structure no. 000000000269390

Built: 1921; 104 years old
Condition: Fair; inspected May 2024
Type: Truss - Thru; Steel
Length: 54 ft; 1 main span
Daily traffic: 5; 2022 count
Owner: County; County Highway Agency

About this bridge

Local over Dd 175 is a steel truss - thru carrying Local over Dd 175 in Palo Alto County, Iowa. It was built in 1921, so it is 104 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. Its operating status is: posted for load restriction.

It carries about 5 vehicles a day, projected to reach 5 by 2044. The structure is 54 ft (16.5 m) long and 16 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesLocal

CrossesDd 175

Location095331801

RouteCounty Highway 0

CountyPalo Alto County

StateIowa

Coordinates43.05306, -94.78957

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.

Component	Rating	Meaning
Deck	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.

Last inspectionMay 2024

Inspection intervalevery 24 months

Operating statusPosted for load restriction

ScourFoundations stable; scour above top of footing

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Deck geometry2: Basically intolerable, requiring high priority of replacement

Waterway adequacy6: Equal to present minimum criteria

Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is

Operating rating32.3 US tons

Inventory rating19.4 US tons

Structure

Structure typeTruss - Thru

MaterialSteel

DeckConcrete, cast-in-place

Main spans1

Design loadH 10

Structure length54 ft (16.5 m)

Longest span50 ft (15.2 m)

Deck width16 ft (4.9 m)

Roadway width16 ft (4.8 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2022)

Projected traffic5 by 2044

Trucks0%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed1.9 mi (3 km)

TollOn a free road

National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency

Maintained byCounty Highway Agency

Historic statusPossibly eligible for the National Register; requires further investigation

Work proposedReplacement because of substandard load-carrying capacity or roadway geometry

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was Local over Dd 175 built?

It was built in 1921, making it 104 years old in 2025.

What condition is Local over Dd 175 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 May 2024.

How much traffic does Local over Dd 175 carry?

About 5 vehicles per day (2022 count).

How long is Local over Dd 175?

The structure is 54 ft (16.5 m) long with a longest span of 50 ft (15.2 m) and a deck 16 ft wide.

Who owns Local over Dd 175?

It is owned by the County Highway Agency.