US Bridges

27th ST SW over Drainage

Good

Linn County, Iowa · Between 28th and 29th Ave · Structure no. 000000000505610

Built
2016
9 years old
Condition
Good
inspected April 2023
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
1,310
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

27th ST SW over Drainage is a concrete culvert carrying 27th ST SW over Drainage in Linn County, Iowa. It was built in 2016, so it is 9 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 1,310 vehicles a day, projected to reach 1,310 by 2043. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Carries27th ST SW
CrossesDrainage
LocationBetween 28th and 29th Ave
RouteCity Street 0
StateIowa
Coordinates41.94988, -91.70757
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating70.8 US tons
Inventory rating54.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length27 ft (8.2 m)
Longest span13 ft (3.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,310 (2021)
Projected traffic1,310 by 2043
Trucks0%
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

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 27th ST SW over Drainage built?

It was built in 2016, making it 9 years old in 2025.

What condition is 27th ST SW over Drainage 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 April 2023.

How much traffic does 27th ST SW over Drainage carry?

About 1,310 vehicles per day (2021 count).

How long is 27th ST SW over Drainage?

The structure is 27 ft (8.2 m) long with a longest span of 13 ft (3.9 m).

Who owns 27th ST SW over Drainage?

It is owned by the City or Municipal Highway Agency.