G24 over Branch North River

Fair

Warren County, Iowa · 077243101 · Structure no. 000000000335340

Built: 1973; 52 years old
Condition: Fair; inspected October 2024
Type: Culvert; Concrete Continuous
Length: 25 ft; 2 main spans
Daily traffic: 1,783; 2022 count
Owner: County; County Highway Agency

About this bridge

G24 over Branch North River is a concrete continuous culvert carrying G24 over Branch North River in Warren County, Iowa. It was built in 1973, so it is 52 years old, older 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 5 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 1,783 vehicles a day, roughly 10% of them trucks, projected to reach 1,783 by 2044. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesG24

CrossesBranch North River

Location077243101

RouteCounty Highway 0

CountyWarren County

StateIowa

Coordinates41.43943, -93.6749

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.

Component	Rating	Meaning
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.
Culvert	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.

Last inspectionOctober 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Waterway adequacy6: Equal to present minimum criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating48.6 US tons

Inventory rating36 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckNot applicable

Main spans2

Design loadHS 20

Structure length25 ft (7.6 m)

Longest span12 ft (3.7 m)

Deck width0 ft (0 m)

Roadway width0 ft (0 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,783 (2022)

Projected traffic1,783 by 2044

Trucks10%

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 proposedReplacement because of substandard load-carrying capacity or roadway geometry

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was G24 over Branch North River built?

It was built in 1973, making it 52 years old in 2025.

What condition is G24 over Branch North River 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 October 2024.

How much traffic does G24 over Branch North River carry?

About 1,783 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is G24 over Branch North River?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).

Who owns G24 over Branch North River?

It is owned by the County Highway Agency.