US Bridges

County Road 29.5 over S. Platte River Overflow

Fair

Logan County, Colorado · 0.7 Mi. N. of Co. Rd. 12 · Structure no. LOG29.5-12.551A

Built
1986
39 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
82 ft
2 main spans
Daily traffic
76
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 29.5 over S. Platte River Overflow is a steel stringer/multi-beam or girder carrying County Road 29.5 over S. Platte River Overflow in Logan County, Colorado. It was built in 1986, so it is 39 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 5 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 76 vehicles a day, roughly 66% of them trucks, projected to reach 94 by 2042. The structure is 82 ft (24.9 m) long and 29 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesCounty Road 29.5
CrossesS. Platte River Overflow
Location0.7 Mi. N. of Co. Rd. 12
RouteCounty Highway 0
CountyLogan County
StateColorado
Coordinates40.51444, -103.30342
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.7 US tons
Inventory rating23.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans2
Design loadUnknown
Structure length82 ft (24.9 m)
Longest span38 ft (11.7 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic76 (2023)
Projected traffic94 by 2042
Trucks66%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 29.5 over S. Platte River Overflow built?

It was built in 1986, making it 39 years old in 2025.

What condition is County Road 29.5 over S. Platte River Overflow 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 29.5 over S. Platte River Overflow carry?

About 76 vehicles per day (2023 count), of which roughly 66% are trucks.

How long is County Road 29.5 over S. Platte River Overflow?

The structure is 82 ft (24.9 m) long with a longest span of 38 ft (11.7 m) and a deck 29 ft wide.

Who owns County Road 29.5 over S. Platte River Overflow?

It is owned by the County Highway Agency.