US Bridges

306th St. over Dibble CR

FairPosted for load

Fayette County, Iowa · 095070203 · Structure no. 000000000152681

Built
1971
54 years old
Condition
Fair
inspected November 2023
Type
Truss - Thru
Steel
Length
62 ft
1 main span
Daily traffic
33
2022 count
Owner
County
County Highway Agency

About this bridge

306th St. over Dibble CR is a steel truss - thru carrying 306th St. over Dibble CR in Fayette County, Iowa. It was built in 1971, so it is 54 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 other load-capacity restriction.

It carries about 33 vehicles a day, projected to reach 33 by 2043. The structure is 62 ft (18.9 m) long and 21 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
Carries306th St.
CrossesDibble CR
Location095070203
RouteCounty Highway 0
CountyFayette County
StateIowa
Coordinates43.07817, -91.62984
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity 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 rating44.8 US tons
Inventory rating29.3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length62 ft (18.9 m)
Longest span60 ft (18.3 m)
Deck width21 ft (6.5 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33 (2022)
Projected traffic33 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 306th St. over Dibble CR built?

It was built in 1971, making it 54 years old in 2025.

What condition is 306th St. over Dibble CR 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 306th St. over Dibble CR carry?

About 33 vehicles per day (2022 count).

How long is 306th St. over Dibble CR?

The structure is 62 ft (18.9 m) long with a longest span of 60 ft (18.3 m) and a deck 21 ft wide.

Who owns 306th St. over Dibble CR?

It is owned by the County Highway Agency.