US Bridges

Local over Trib to Mason Creek

Fair

Guthrie County, Iowa · 079323403 · Structure no. 000000000168420

Built
1959
66 years old
Condition
Fair
inspected November 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
56 ft
1 main span
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

Local over Trib to Mason Creek is a prestressed concrete stringer/multi-beam or girder carrying Local over Trib to Mason Creek in Guthrie County, Iowa. It was built in 1959, so it is 66 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 11 vehicles a day, projected to reach 11 by 2042. The structure is 56 ft (17.1 m) long and 22 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesLocal
CrossesTrib to Mason Creek
Location079323403
RouteCounty Highway 0
CountyGuthrie County
StateIowa
Coordinates41.61367, -94.55511
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.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2022
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40.7 US tons
Inventory rating18 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length56 ft (17.1 m)
Longest span55 ft (16.8 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2022)
Projected traffic11 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Local over Trib to Mason Creek built?

It was built in 1959, making it 66 years old in 2025.

What condition is Local over Trib to Mason Creek 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 2022.

How much traffic does Local over Trib to Mason Creek carry?

About 11 vehicles per day (2022 count).

How long is Local over Trib to Mason Creek?

The structure is 56 ft (17.1 m) long with a longest span of 55 ft (16.8 m) and a deck 22 ft wide.

Who owns Local over Trib to Mason Creek?

It is owned by the County Highway Agency.