US Bridges

Loc 320 Ave over Small Stream

Poor

Delaware County, Iowa · 087031402 · Structure no. 000000000139310

Built
1971
54 years old
Condition
Poor
inspected March 2024
Type
Tee Beam
Concrete
Length
36 ft
1 main span
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

Loc 320 Ave over Small Stream is a concrete tee beam carrying Loc 320 Ave over Small Stream in Delaware County, Iowa. It was built in 1971, so it is 54 years old, older 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 20 vehicles a day, projected to reach 20 by 2044. The structure is 36 ft (11 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLoc 320 Ave
CrossesSmall Stream
Location087031402
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.3519, -91.16991
Functional classRural Local

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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.4 US tons
Inventory rating27.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadH 15
Structure length36 ft (11 m)
Longest span35 ft (10.7 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Loc 320 Ave over Small Stream built?

It was built in 1971, making it 54 years old in 2025.

What condition is Loc 320 Ave over Small Stream 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 March 2024.

How much traffic does Loc 320 Ave over Small Stream carry?

About 20 vehicles per day (2022 count).

How long is Loc 320 Ave over Small Stream?

The structure is 36 ft (11 m) long with a longest span of 35 ft (10.7 m) and a deck 26 ft wide.

Who owns Loc 320 Ave over Small Stream?

It is owned by the County Highway Agency.