US Bridges

450th ST over Br of Chariton River

Good

Lucas County, Iowa · 071221103 · Structure no. 000000000225621

Built
2018
7 years old
Condition
Good
inspected November 2024
Type
Slab
Steel
Length
48 ft
1 main span
Daily traffic
16
2022 count
Owner
County
County Highway Agency

About this bridge

450th ST over Br of Chariton River is a steel slab carrying 450th ST over Br of Chariton River in Lucas County, Iowa. It was built in 2018, so it is 7 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 16 vehicles a day, projected to reach 16 by 2044. The structure is 48 ft (14.6 m) long and 26 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Carries450th ST
CrossesBr of Chariton River
Location071221103
RouteCounty Highway 0
StateIowa
Coordinates40.9703, -93.35096
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating43.5 US tons
Inventory rating26.1 US tons

Structure

Structure typeSlab
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length48 ft (14.6 m)
Longest span47 ft (14.3 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16 (2022)
Projected traffic16 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 450th ST over Br of Chariton River built?

It was built in 2018, making it 7 years old in 2025.

What condition is 450th ST over Br of Chariton River 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 2024.

How much traffic does 450th ST over Br of Chariton River carry?

About 16 vehicles per day (2022 count).

How long is 450th ST over Br of Chariton River?

The structure is 48 ft (14.6 m) long with a longest span of 47 ft (14.3 m) and a deck 26 ft wide.

Who owns 450th ST over Br of Chariton River?

It is owned by the County Highway Agency.