US Bridges

County Road over Mosquito Creek

PoorClosed to traffic

Dallas County, Iowa · 079290805 · Structure no. 000000000131830

Built
1900
125 years old
Condition
Poor
inspected November 2019
Type
Truss - Thru
Steel
Length
144 ft
1 main span
Daily traffic
21
2022 count
Owner
County
County Highway Agency

About this bridge

County Road over Mosquito Creek is a steel truss - thru carrying County Road over Mosquito Creek in Dallas County, Iowa. It was built in 1900, so it is 125 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 0 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: closed to all traffic.

It carries about 21 vehicles a day, projected to reach 21 by 2039. The structure is 144 ft (43.9 m) long and 16 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty Road
CrossesMosquito Creek
Location079290805
RouteCounty Highway 0
CountyDallas County
StateIowa
Coordinates41.66605, -94.24409
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
Deck0 FailedOut of service and beyond corrective action.
Superstructure0 FailedOut of service and beyond corrective action.
Substructure0 FailedOut of service and beyond corrective action.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2019
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour above top of footing
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry0: Immediate repair necessary to put back in service
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment0: Immediate repair necessary to put back in service
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length144 ft (43.9 m)
Longest span142 ft (43.3 m)
Deck width16 ft (4.8 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deck13 ft (4 m)

Traffic and service

Average daily traffic21 (2022)
Projected traffic21 by 2039
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road over Mosquito Creek built?

It was built in 1900, making it 125 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 November 2019.

How much traffic does County Road over Mosquito Creek carry?

About 21 vehicles per day (2022 count).

How long is County Road over Mosquito Creek?

The structure is 144 ft (43.9 m) long with a longest span of 142 ft (43.3 m) and a deck 16 ft wide.

Who owns County Road over Mosquito Creek?

It is owned by the County Highway Agency.