US Bridges

270th ST over So Branch Salt Creek

Good

Tama County, Iowa · 084143401 · Structure no. 000000000318901

Built
2014
11 years old
Condition
Good
inspected September 2024
Type
Slab
Steel
Length
71 ft
1 main span
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

270th ST over So Branch Salt Creek is a steel slab carrying 270th ST over So Branch Salt Creek in Tama County, Iowa. It was built in 2014, so it is 11 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 11 vehicles a day, projected to reach 11 by 2044. The structure is 71 ft (21.6 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Carries270th ST
CrossesSo Branch Salt Creek
Location084143401
RouteCounty Highway 0
StateIowa
Coordinates42.05029, -92.469
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 protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating54.6 US tons
Inventory rating32.7 US tons

Structure

Structure typeSlab
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length71 ft (21.6 m)
Longest span70 ft (21.3 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2022)
Projected traffic11 by 2044
Trucks0%
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 270th ST over So Branch Salt Creek built?

It was built in 2014, making it 11 years old in 2025.

What condition is 270th ST over So Branch Salt Creek 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 September 2024.

How much traffic does 270th ST over So Branch Salt Creek carry?

About 11 vehicles per day (2022 count).

How long is 270th ST over So Branch Salt Creek?

The structure is 71 ft (21.6 m) long with a longest span of 70 ft (21.3 m) and a deck 31 ft wide.

Who owns 270th ST over So Branch Salt Creek?

It is owned by the County Highway Agency.