US Bridges

Loc 128 Trail over Boyer River

PoorPosted for load

Harrison County, Iowa · 081411705 · Structure no. 000000000179185

Built
1940
85 years old, rebuilt 1977
Condition
Poor
inspected February 2024
Type
Truss - Thru
Steel
Length
162 ft
1 main span
Daily traffic
89
2022 count
Owner
County
County Highway Agency

About this bridge

Loc 128 Trail over Boyer River is a steel truss - thru carrying Loc 128 Trail over Boyer River in Harrison County, Iowa. It was built in 1940 and reconstructed in 1977, so it is 85 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. Its operating status is: posted for load restriction.

It carries about 89 vehicles a day, projected to reach 89 by 2044. The structure is 162 ft (49.4 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesLoc 128 Trail
CrossesBoyer River
Location081411705
RouteCounty Highway 0
StateIowa
Coordinates41.82381, -95.63565
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating15.5 US tons
Inventory rating10.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1 (+1 approach)
Design loadHS 20
Structure length162 ft (49.4 m)
Longest span120 ft (36.6 m)
Deck width24 ft (7.3 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deck15 ft (4.4 m)

Traffic and service

Average daily traffic89 (2022)
Projected traffic89 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Loc 128 Trail over Boyer River built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1977.

What condition is Loc 128 Trail over Boyer River 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 February 2024.

How much traffic does Loc 128 Trail over Boyer River carry?

About 89 vehicles per day (2022 count).

How long is Loc 128 Trail over Boyer River?

The structure is 162 ft (49.4 m) long with a longest span of 120 ft (36.6 m) and a deck 24 ft wide.

Who owns Loc 128 Trail over Boyer River?

It is owned by the County Highway Agency.