US Bridges

Local over Mosquito Creek

PoorClosed to traffic

Shelby County, Iowa · 080403505 · Structure no. 000000000306920

Built
1930
95 years old
Condition
Poor
inspected April 2024
Type
Truss - Thru
Steel
Length
199 ft
1 main span
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

Local over Mosquito Creek is a steel truss - thru carrying Local over Mosquito Creek in Shelby County, Iowa. It was built in 1930, so it is 95 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 1 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 26 vehicles a day, roughly 15% of them trucks, projected to reach 26 by 2044. The structure is 199 ft (60.7 m) long and 15 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesLocal
CrossesMosquito Creek
Location080403505
RouteCounty Highway 0
StateIowa
Coordinates41.70017, -95.4727
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure1 Imminent FailureMajor deterioration or section loss present in critical structural components. Bridge is closed to traffic but corrective action may put it back in light service.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusClosed to all traffic
ScourUnknown foundation; not evaluated for scour
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+5 approach)
Design loadUnknown
Structure length199 ft (60.7 m)
Longest span70 ft (21.3 m)
Deck width15 ft (4.6 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 by 2044
Trucks15%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Mosquito Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is Local 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 April 2024.

How much traffic does Local over Mosquito Creek carry?

About 26 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is Local over Mosquito Creek?

The structure is 199 ft (60.7 m) long with a longest span of 70 ft (21.3 m) and a deck 15 ft wide.

Who owns Local over Mosquito Creek?

It is owned by the County Highway Agency.