US Bridges

500th ST over Dog Creek

Good

O'Brien County, Iowa · 0943934 · Structure no. 000000000258741

Built
2009
16 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
32 ft
2 main spans
Daily traffic
10
2022 count
Owner
County
County Highway Agency

About this bridge

500th ST over Dog Creek is a wood or timber stringer/multi-beam or girder carrying 500th ST over Dog Creek in O'Brien County, Iowa. It was built in 2009, so it is 16 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10 vehicles a day, projected to reach 10 by 2043. The structure is 32 ft (9.8 m) long and 26 ft wide.

Carries500th ST
CrossesDog Creek
Location0943934
RouteCounty Highway 0
StateIowa
Coordinates42.92451, -95.43742
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.7 US tons
Inventory rating32 US tons

Structure

MaterialWood or Timber
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span15 ft (4.6 m)
Deck width26 ft (7.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2022)
Projected traffic10 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost$60,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 500th ST over Dog Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is 500th ST over Dog Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does 500th ST over Dog Creek carry?

About 10 vehicles per day (2022 count).

How long is 500th ST over Dog Creek?

The structure is 32 ft (9.8 m) long with a longest span of 15 ft (4.6 m) and a deck 26 ft wide.

Who owns 500th ST over Dog Creek?

It is owned by the County Highway Agency.