US Bridges

County Road 40 over South Platte River

Fair

Logan County, Colorado · 0.7 MI E of US HWY 138 · Structure no. LOG40-47.5-116A

Built
1988
37 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
832 ft
11 main spans
Daily traffic
127
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 40 over South Platte River is a steel stringer/multi-beam or girder carrying County Road 40 over South Platte River in Logan County, Colorado. It was built in 1988, so it is 37 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 127 vehicles a day, roughly 16% of them trucks, projected to reach 156 by 2042. The structure is 832 ft (253.7 m) long and 31 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesCounty Road 40
CrossesSouth Platte River
Location0.7 MI E of US HWY 138
RouteCounty Highway 0
CountyLogan County
StateColorado
Coordinates40.71694, -103.125
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans11
Design loadUnknown
Structure length832 ft (253.7 m)
Longest span74 ft (22.7 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic127 (2023)
Projected traffic156 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 40 over South Platte River built?

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

What condition is County Road 40 over South Platte River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.

How much traffic does County Road 40 over South Platte River carry?

About 127 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is County Road 40 over South Platte River?

The structure is 832 ft (253.7 m) long with a longest span of 74 ft (22.7 m) and a deck 31 ft wide.

Who owns County Road 40 over South Platte River?

It is owned by the County Highway Agency.