US Bridges

Local Road over Mill Branch

PoorClosed to traffic

Warren County, Iowa · 074233602 · Structure no. 000000000333080

Built
1920
105 years old, rebuilt 1961
Condition
Poor
inspected September 2024
Type
Truss - Thru
Steel
Length
52 ft
1 main span
Daily traffic
82
2022 count
Owner
County
County Highway Agency

About this bridge

Local Road over Mill Branch is a steel truss - thru carrying Local Road over Mill Branch in Warren County, Iowa. It was built in 1920 and reconstructed in 1961, so it is 105 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 82 vehicles a day, projected to reach 82 by 2044. The structure is 52 ft (15.9 m) long and 18 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLocal Road
CrossesMill Branch
Location074233602
RouteCounty Highway 0
CountyWarren County
StateIowa
Coordinates41.17006, -93.46136
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 inspectionSeptember 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
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
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length52 ft (15.9 m)
Longest span50 ft (15.2 m)
Deck width18 ft (5.6 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic82 (2022)
Projected traffic82 by 2044
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$634,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Local Road over Mill Branch built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1961.

What condition is Local Road over Mill Branch 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 September 2024.

How much traffic does Local Road over Mill Branch carry?

About 82 vehicles per day (2022 count).

How long is Local Road over Mill Branch?

The structure is 52 ft (15.9 m) long with a longest span of 50 ft (15.2 m) and a deck 18 ft wide.

Who owns Local Road over Mill Branch?

It is owned by the County Highway Agency.