Local over Rock River

PoorClosed to traffic

Lyon County, Iowa · 098462303 · Structure no. 000000000228840

Built: 1900; 125 years old
Condition: Poor; inspected July 2024
Type: Truss - Thru; Steel
Length: 192 ft; 1 main span
Daily traffic: 62; 2022 count
Owner: County; County Highway Agency

About this bridge

Local over Rock River is a steel truss - thru carrying Local over Rock River in Lyon County, Iowa. It was built in 1900, so it is 125 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 0 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: closed to all traffic.

It carries about 62 vehicles a day, projected to reach 62 by 2044. The structure is 192 ft (58.5 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesLocal

CrossesRock River

Location098462303

RouteCounty Highway 0

CountyLyon County

StateIowa

Coordinates43.28797, -96.2428

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.

Component	Rating	Meaning
Deck	0 Failed	Out of service and beyond corrective action.
Superstructure	0 Failed	Out of service and beyond corrective action.
Substructure	0 Failed	Out of service and beyond corrective action.
Channel and channel protection	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.

Last inspectionJuly 2024

Inspection intervalevery 12 months

Operating statusClosed to all traffic

ScourFoundations stable; scour above top of footing

Structural evaluation0: Immediate repair necessary to put back in service

Deck geometry0: Immediate repair necessary to put back in service

Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is

Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is

Operating rating0 US tons

Inventory rating0 US tons

Structure

Structure typeTruss - Thru

MaterialSteel

DeckWood or timber

Main spans1 (+4 approach)

Design loadUnknown

Structure length192 ft (58.5 m)

Longest span122 ft (37.2 m)

Deck width16 ft (5 m)

Roadway width16 ft (5 m)

Vertical clearance over deck10 ft (3.1 m)

Traffic and service

Average daily traffic62 (2022)

Projected traffic62 by 2044

Trucks0%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed5 mi (8 km)

TollOn a free road

National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency

Maintained byCounty Highway Agency

Historic statusPossibly eligible for the National Register; requires further investigation

Work proposedReplacement because of substandard load-carrying capacity or roadway geometry

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was Local over Rock River built?

It was built in 1900, making it 125 years old in 2025.

What condition is Local over Rock 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 July 2024.

How much traffic does Local over Rock River carry?

About 62 vehicles per day (2022 count).

How long is Local over Rock River?

The structure is 192 ft (58.5 m) long with a longest span of 122 ft (37.2 m) and a deck 16 ft wide.

Who owns Local over Rock River?

It is owned by the County Highway Agency.