US Bridges

County Road over Branch Mosquito Creek

Poor

Dallas County, Iowa · 079290803 · Structure no. 000000000131820

Built
1926
99 years old, rebuilt 1999
Condition
Poor
inspected November 2023
Type
Slab
Concrete
Length
24 ft
1 main span
Daily traffic
21
2022 count
Owner
County
County Highway Agency

About this bridge

County Road over Branch Mosquito Creek is a concrete slab carrying County Road over Branch Mosquito Creek in Dallas County, Iowa. It was built in 1926 and reconstructed in 1999, so it is 99 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 4 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.

It carries about 21 vehicles a day, projected to reach 21 by 2043. The structure is 24 ft (7.3 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesCounty Road
CrossesBranch Mosquito Creek
Location079290803
RouteCounty Highway 0
StateIowa
Coordinates41.67334, -94.24643
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, 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 statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating43.5 US tons
Inventory rating26.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width31 ft (9.3 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21 (2022)
Projected traffic21 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$350,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road over Branch Mosquito Creek built?

It was built in 1926, making it 99 years old in 2025. It was reconstructed in 1999.

What condition is County Road over Branch 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 2023.

How much traffic does County Road over Branch Mosquito Creek carry?

About 21 vehicles per day (2022 count).

How long is County Road over Branch Mosquito Creek?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 31 ft wide.

Who owns County Road over Branch Mosquito Creek?

It is owned by the County Highway Agency.