US Bridges

8th Ave over Indian Creek

Poor

Linn County, Iowa · 083070100 · Structure no. 000000000007691

Built
1988
37 years old
Condition
Poor
inspected April 2024
Type
Slab
Concrete Continuous
Length
227 ft
6 main spans
Daily traffic
10,789
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

8th Ave over Indian Creek is a concrete continuous slab carrying 8th Ave over Indian Creek in Linn County, Iowa. It was built in 1988, so it is 37 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 10,789 vehicles a day, projected to reach 10,789 by 2044. The structure is 227 ft (69.2 m) long and 53 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries8th Ave
CrossesIndian Creek
Location083070100
RouteCity Street 0
CountyLinn County
StateIowa
Coordinates42.03426, -91.61192
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating86.3 US tons
Inventory rating51.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length227 ft (69.2 m)
Longest span41 ft (12.5 m)
Deck width53 ft (16.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,789 (2022)
Projected traffic10,789 by 2044
Trucks0%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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$12,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 8th Ave over Indian Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is 8th Ave over Indian Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2024.

How much traffic does 8th Ave over Indian Creek carry?

About 10,789 vehicles per day (2022 count).

How long is 8th Ave over Indian Creek?

The structure is 227 ft (69.2 m) long with a longest span of 41 ft (12.5 m) and a deck 53 ft wide.

Who owns 8th Ave over Indian Creek?

It is owned by the City or Municipal Highway Agency.