US Bridges

SH 63 Ml over South Platte River

Fair

Logan County, Colorado · 2.7MI N of JCT I76 · Structure no. B-23-AU

Built
1982
43 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
498 ft
5 main spans
Daily traffic
2,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 63 Ml over South Platte River is a prestressed concrete continuous stringer/multi-beam or girder carrying SH 63 Ml over South Platte River in Logan County, Colorado. It was built in 1982, so it is 43 years old, older 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 2,000 vehicles a day, roughly 9% of them trucks, projected to reach 2,320 by 2040. The structure is 498 ft (151.9 m) long and 43 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSH 63 Ml
CrossesSouth Platte River
Location2.7MI N of JCT I76
RouteState Highway 63A
Coordinates40.53894, -103.26707
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.7 US tons
Inventory rating29.2 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length498 ft (151.9 m)
Longest span100 ft (30.4 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2020)
Projected traffic2,320 by 2040
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 SH 63 Ml over South Platte River built?

It was built in 1982, making it 43 years old in 2025.

What condition is SH 63 Ml 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 July 2023.

How much traffic does SH 63 Ml over South Platte River carry?

About 2,000 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is SH 63 Ml over South Platte River?

The structure is 498 ft (151.9 m) long with a longest span of 100 ft (30.4 m) and a deck 43 ft wide.

Who owns SH 63 Ml over South Platte River?

It is owned by the State Highway Agency.