US Bridges

FM Mahaffy Br R over Stream

Fair

Johnson County, Iowa · 081062806 · Structure no. 000000000205591

Built
2000
25 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete Continuous
Length
40 ft
2 main spans
Daily traffic
3,730
2021 count
Owner
County
County Highway Agency

About this bridge

FM Mahaffy Br R over Stream is a concrete continuous slab carrying FM Mahaffy Br R over Stream in Johnson County, Iowa. It was built in 2000, so it is 25 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 3,730 vehicles a day, roughly 9% of them trucks, projected to reach 3,730 by 2043. The structure is 40 ft (12.2 m) long and 47 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesFM Mahaffy Br R
CrossesStream
Location081062806
RouteCounty Highway 0
CountyJohnson County
StateIowa
Coordinates41.79291, -91.54616
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating26.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span20 ft (6.1 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,730 (2021)
Projected traffic3,730 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM Mahaffy Br R over Stream built?

It was built in 2000, making it 25 years old in 2025.

What condition is FM Mahaffy Br R over Stream in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does FM Mahaffy Br R over Stream carry?

About 3,730 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is FM Mahaffy Br R over Stream?

The structure is 40 ft (12.2 m) long with a longest span of 20 ft (6.1 m) and a deck 47 ft wide.

Who owns FM Mahaffy Br R over Stream?

It is owned by the County Highway Agency.