US Bridges

Local over Mercer Creek

Good

Dallas County, Iowa · 078281203 · Structure no. 000000000131271

Built
1974
51 years old
Condition
Good
inspected November 2021
Type
Culvert
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
62
2022 count
Owner
County
County Highway Agency

About this bridge

Local over Mercer Creek is a concrete continuous culvert carrying Local over Mercer Creek in Dallas County, Iowa. It was built in 1974, so it is 51 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 62 vehicles a day, projected to reach 62 by 2043. The structure is 31 ft (9.4 m) long. If it were closed, the detour would be 6.2 mi (10 km).

CarriesLocal
CrossesMercer Creek
Location078281203
RouteCounty Highway 0
StateIowa
Coordinates41.56389, -94.03095
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating85.3 US tons
Inventory rating51 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length31 ft (9.4 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic62 (2022)
Projected traffic62 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Local over Mercer Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is Local over Mercer Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2021.

How much traffic does Local over Mercer Creek carry?

About 62 vehicles per day (2022 count).

How long is Local over Mercer Creek?

The structure is 31 ft (9.4 m) long with a longest span of 14 ft (4.3 m).

Who owns Local over Mercer Creek?

It is owned by the County Highway Agency.