US Bridges

495th over Shellrock River

FairPosted for load

Worth County, Iowa · 100201807 · Structure no. 000000000356440

Built
1955
70 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
127 ft
3 main spans
Daily traffic
104
2022 count
Owner
County
County Highway Agency

About this bridge

495th over Shellrock River is a steel continuous stringer/multi-beam or girder carrying 495th over Shellrock River in Worth County, Iowa. It was built in 1955, so it is 70 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 104 vehicles a day, projected to reach 104 by 2043. The structure is 127 ft (38.7 m) long and 22 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
Carries495th
CrossesShellrock River
Location100201807
RouteCounty Highway 0
CountyWorth County
StateIowa
Coordinates43.48053, -93.25741
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.2 US tons
Inventory rating16.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length127 ft (38.7 m)
Longest span49 ft (14.9 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic104 (2022)
Projected traffic104 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 495th over Shellrock River built?

It was built in 1955, making it 70 years old in 2025.

What condition is 495th over Shellrock River 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 November 2023.

How much traffic does 495th over Shellrock River carry?

About 104 vehicles per day (2022 count).

How long is 495th over Shellrock River?

The structure is 127 ft (38.7 m) long with a longest span of 49 ft (14.9 m) and a deck 22 ft wide.

Who owns 495th over Shellrock River?

It is owned by the County Highway Agency.