US Bridges

Cottage Grove over Indian Creek

Fair

Linn County, Iowa · 000000000 · Structure no. 000000000001330

Built
1948
77 years old, rebuilt 2000
Condition
Fair
inspected April 2023
Type
Slab
Concrete Continuous
Length
150 ft
3 main spans
Daily traffic
3,980
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Cottage Grove over Indian Creek is a concrete continuous slab carrying Cottage Grove over Indian Creek in Linn County, Iowa. It was built in 1948 and reconstructed in 2000, so it is 77 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 3,980 vehicles a day, projected to reach 3,980 by 2043. The structure is 150 ft (45.7 m) long and 59 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCottage Grove
CrossesIndian Creek
Location000000000
RouteCity Street 0
CountyLinn County
StateIowa
Coordinates41.99503, -91.61798
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59.1 US tons
Inventory rating35.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span18 ft (5.5 m)
Deck width59 ft (18 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,980 (2021)
Projected traffic3,980 by 2043
Trucks0%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Cottage Grove over Indian Creek built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 2000.

What condition is Cottage Grove over Indian Creek 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 April 2023.

How much traffic does Cottage Grove over Indian Creek carry?

About 3,980 vehicles per day (2021 count).

How long is Cottage Grove over Indian Creek?

The structure is 150 ft (45.7 m) long with a longest span of 18 ft (5.5 m) and a deck 59 ft wide.

Who owns Cottage Grove over Indian Creek?

It is owned by the City or Municipal Highway Agency.