US Bridges

County Road over Mosquito Creek

PoorPosted for load

Dallas County, Iowa · 080290502 · Structure no. 000000000132140

Built
1942
83 years old
Condition
Poor
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
81 ft
1 main span
Daily traffic
72
2022 count
Owner
County
County Highway Agency

About this bridge

County Road over Mosquito Creek is a steel stringer/multi-beam or girder carrying County Road over Mosquito Creek in Dallas County, Iowa. It was built in 1942, so it is 83 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 72 vehicles a day, projected to reach 72 by 2043. The structure is 81 ft (24.7 m) long and 21 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCounty Road
CrossesMosquito Creek
Location080290502
RouteCounty Highway 0
StateIowa
Coordinates41.76145, -94.26057
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
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 rating11.7 US tons
Inventory rating8.7 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadUnknown
Structure length81 ft (24.7 m)
Longest span38 ft (11.6 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic72 (2022)
Projected traffic72 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$900,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road over Mosquito Creek built?

It was built in 1942, making it 83 years old in 2025.

What condition is County Road over Mosquito Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.

How much traffic does County Road over Mosquito Creek carry?

About 72 vehicles per day (2022 count).

How long is County Road over Mosquito Creek?

The structure is 81 ft (24.7 m) long with a longest span of 38 ft (11.6 m) and a deck 21 ft wide.

Who owns County Road over Mosquito Creek?

It is owned by the County Highway Agency.