US Bridges

2nd ST over Boone River

Fair

Hamilton County, Iowa · 000000000 · Structure no. 000000000026370

Built
1950
75 years old, rebuilt 1978
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
294 ft
4 main spans
Daily traffic
3,797
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

2nd ST over Boone River is a steel continuous stringer/multi-beam or girder carrying 2nd ST over Boone River in Hamilton County, Iowa. It was built in 1950 and reconstructed in 1978, so it is 75 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 3,797 vehicles a day, projected to reach 3,797 by 2044. The structure is 294 ft (89.6 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries2nd ST
CrossesBoone River
Location000000000
RouteCity Street 0
CountyHamilton County
StateIowa
Coordinates42.46941, -93.81131
Functional classUrban Minor Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.9 US tons
Inventory rating30.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length294 ft (89.6 m)
Longest span82 ft (25 m)
Deck width41 ft (12.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,797 (2022)
Projected traffic3,797 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 2nd ST over Boone River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1978.

What condition is 2nd ST over Boone 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 August 2024.

How much traffic does 2nd ST over Boone River carry?

About 3,797 vehicles per day (2022 count).

How long is 2nd ST over Boone River?

The structure is 294 ft (89.6 m) long with a longest span of 82 ft (25 m) and a deck 41 ft wide.

Who owns 2nd ST over Boone River?

It is owned by the City or Municipal Highway Agency.