US Bridges

Exchange ST over Drainage

Fair

Shelby County, Iowa · 000000000 · Structure no. 000000000005930

Built
1900
125 years old
Condition
Fair
inspected December 2024
Type
Tee Beam
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
452
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Exchange ST over Drainage is a prestressed concrete tee beam carrying Exchange ST over Drainage in Shelby 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 452 vehicles a day, projected to reach 452 by 2044. The structure is 24 ft (7.3 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesExchange ST
CrossesDrainage
Location000000000
RouteCity Street 0
CountyShelby County
StateIowa
Coordinates41.64823, -95.31563
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
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating45 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width34 ft (10.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic452 (2022)
Projected traffic452 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$85,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Exchange ST over Drainage built?

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

What condition is Exchange ST over Drainage 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 December 2024.

How much traffic does Exchange ST over Drainage carry?

About 452 vehicles per day (2022 count).

How long is Exchange ST over Drainage?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 34 ft wide.

Who owns Exchange ST over Drainage?

It is owned by the City or Municipal Highway Agency.