US Bridges

Local- 600th ST over Rock Creek

PoorPosted for load

Cherokee County, Iowa · 090410401 · Structure no. 000000000107410

Built
1900
125 years old
Condition
Poor
inspected August 2023
Type
Truss - Thru
Steel
Length
52 ft
1 main span
Daily traffic
20
2022 count
Owner
County
County Highway Agency

About this bridge

Local- 600th ST over Rock Creek is a steel truss - thru carrying Local- 600th ST over Rock Creek in Cherokee 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 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 20 vehicles a day, projected to reach 20 by 2043. The structure is 52 ft (15.9 m) long and 18 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLocal- 600th ST
CrossesRock Creek
Location090410401
RouteCounty Highway 0
CountyCherokee County
StateIowa
Coordinates42.64804, -95.69374
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating19.8 US tons
Inventory rating10.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length52 ft (15.9 m)
Longest span50 ft (15.2 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)
Projected traffic20 by 2043
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$634,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Local- 600th ST over Rock Creek built?

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

What condition is Local- 600th ST over Rock 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 August 2023.

How much traffic does Local- 600th ST over Rock Creek carry?

About 20 vehicles per day (2022 count).

How long is Local- 600th ST over Rock Creek?

The structure is 52 ft (15.9 m) long with a longest span of 50 ft (15.2 m) and a deck 18 ft wide.

Who owns Local- 600th ST over Rock Creek?

It is owned by the County Highway Agency.