US Bridges

SH 59 Ml over S Fk Republican River

Good

Kit Carson County, Colorado · 4.2 MI N of Seibert · Structure no. G-25-C

Built
1969
56 years old
Condition
Good
inspected March 2025
Type
Tee Beam
Concrete Continuous
Length
190 ft
4 main spans
Daily traffic
640
2020 count
Owner
State
State Highway Agency

About this bridge

SH 59 Ml over S Fk Republican River is a concrete continuous tee beam carrying SH 59 Ml over S Fk Republican River in Kit Carson County, Colorado. It was built in 1969, so it is 56 years old, older 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 640 vehicles a day, roughly 27% of them trucks, projected to reach 762 by 2040. The structure is 190 ft (57.9 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesSH 59 Ml
CrossesS Fk Republican River
Location4.2 MI N of Seibert
RouteState Highway 59A
Coordinates39.35328, -102.87333
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating31 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckOther
Main spans4
Design loadHS 20 + Mod
Structure length190 ft (57.9 m)
Longest span52 ft (16 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic640 (2020)
Projected traffic762 by 2040
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 S Fk Republican River built?

It was built in 1969, making it 56 years old in 2025.

What condition is SH 59 Ml over S Fk Republican River 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 S Fk Republican River carry?

About 640 vehicles per day (2020 count), of which roughly 27% are trucks.

How long is SH 59 Ml over S Fk Republican River?

The structure is 190 ft (57.9 m) long with a longest span of 52 ft (16 m) and a deck 36 ft wide.

Who owns SH 59 Ml over S Fk Republican River?

It is owned by the State Highway Agency.