US Bridges

HWY 299 over S Fork Iowa River

Fair

Hardin County, Iowa · 087202702 · Structure no. 000000000027300

Built
1939
86 years old, rebuilt 2009
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
185 ft
3 main spans
Daily traffic
609
2022 count
Owner
County
County Highway Agency

About this bridge

HWY 299 over S Fork Iowa River is a steel continuous stringer/multi-beam or girder carrying HWY 299 over S Fork Iowa River in Hardin County, Iowa. It was built in 1939 and reconstructed in 2009, so it is 86 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 609 vehicles a day, roughly 19% of them trucks, projected to reach 609 by 2044. The structure is 185 ft (56.4 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesHWY 299
CrossesS Fork Iowa River
Location087202702
RouteCounty Highway 0
CountyHardin County
StateIowa
Coordinates42.32347, -93.16939
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating56.9 US tons
Inventory rating34.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length185 ft (56.4 m)
Longest span70 ft (21.3 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic609 (2022)
Projected traffic609 by 2044
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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$2.3 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 299 over S Fork Iowa River built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 2009.

What condition is HWY 299 over S Fork Iowa 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 February 2024.

How much traffic does HWY 299 over S Fork Iowa River carry?

About 609 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is HWY 299 over S Fork Iowa River?

The structure is 185 ft (56.4 m) long with a longest span of 70 ft (21.3 m) and a deck 28 ft wide.

Who owns HWY 299 over S Fork Iowa River?

It is owned by the County Highway Agency.