US Bridges

SH 59 Ml over I 70 Ml

Good

Kit Carson County, Colorado · I70 at Seibert · Structure no. G-25-Q

Built
2018
7 years old
Condition
Good
inspected March 2025
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
242 ft
2 main spans
Daily traffic
1,200
2018 count
Owner
State
State Highway Agency

About this bridge

SH 59 Ml over I 70 Ml is a prestressed concrete continuous box beam or girders - multiple carrying SH 59 Ml over I 70 Ml in Kit Carson County, Colorado. It was built in 2018, so it is 7 years old, younger than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,200 vehicles a day, roughly 34% of them trucks, projected to reach 1,847 by 2038. The structure is 242 ft (73.9 m) long and 44 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesSH 59 Ml
CrossesI 70 Ml
LocationI70 at Seibert
RouteState Highway 59A
Coordinates39.29306, -102.87411
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating46.4 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length242 ft (73.9 m)
Longest span120 ft (36.6 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2018)
Projected traffic1,847 by 2038
Trucks34%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed6.2 mi (10 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 59 Ml over I 70 Ml built?

It was built in 2018, making it 7 years old in 2025.

What condition is SH 59 Ml over I 70 Ml in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2025.

How much traffic does SH 59 Ml over I 70 Ml carry?

About 1,200 vehicles per day (2018 count), of which roughly 34% are trucks.

How long is SH 59 Ml over I 70 Ml?

The structure is 242 ft (73.9 m) long with a longest span of 120 ft (36.6 m) and a deck 44 ft wide.

Who owns SH 59 Ml over I 70 Ml?

It is owned by the State Highway Agency.