US Bridges

1250th ST over Trib to Mosquito Creek

Good

Shelby County, Iowa · 079400303 · Structure no. 000000000305711

Built
2021
4 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
130 ft
1 main span
Daily traffic
42
2021 count
Owner
County
County Highway Agency

About this bridge

1250th ST over Trib to Mosquito Creek is a steel stringer/multi-beam or girder carrying 1250th ST over Trib to Mosquito Creek in Shelby County, Iowa. It was built in 2021, so it is 4 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 42 vehicles a day, projected to reach 42 by 2043. The structure is 130 ft (39.6 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries1250th ST
CrossesTrib to Mosquito Creek
Location079400303
RouteCounty Highway 0
CountyShelby County
StateIowa
Coordinates41.68204, -95.49042
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.3 US tons
Inventory rating27.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1 (+3 approach)
Design loadUnknown
Structure length130 ft (39.6 m)
Longest span50 ft (15.2 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42 (2021)
Projected traffic42 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 1250th ST over Trib to Mosquito Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is 1250th ST over Trib to Mosquito 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 March 2023.

How much traffic does 1250th ST over Trib to Mosquito Creek carry?

About 42 vehicles per day (2021 count).

How long is 1250th ST over Trib to Mosquito Creek?

The structure is 130 ft (39.6 m) long with a longest span of 50 ft (15.2 m) and a deck 24 ft wide.

Who owns 1250th ST over Trib to Mosquito Creek?

It is owned by the County Highway Agency.