US Bridges

SH 61 Ml over Rock Creek

Fair

Washington County, Colorado · 14.8 MI No of Otis · Structure no. C-25-A

Built
1965
60 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
70 ft
3 main spans
Daily traffic
440
2020 count
Owner
State
State Highway Agency

About this bridge

SH 61 Ml over Rock Creek is a concrete tee beam carrying SH 61 Ml over Rock Creek in Washington County, Colorado. It was built in 1965, so it is 60 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 440 vehicles a day, roughly 18% of them trucks, projected to reach 603 by 2040. The structure is 70 ft (21.3 m) long and 34 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesSH 61 Ml
CrossesRock Creek
Location14.8 MI No of Otis
RouteState Highway 61A
Coordinates40.36136, -102.97307
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.4 US tons
Inventory rating35.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span21 ft (6.4 m)
Deck width34 ft (10.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic440 (2020)
Projected traffic603 by 2040
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 61 Ml over Rock Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is SH 61 Ml over Rock Creek 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 August 2023.

How much traffic does SH 61 Ml over Rock Creek carry?

About 440 vehicles per day (2020 count), of which roughly 18% are trucks.

How long is SH 61 Ml over Rock Creek?

The structure is 70 ft (21.3 m) long with a longest span of 21 ft (6.4 m) and a deck 34 ft wide.

Who owns SH 61 Ml over Rock Creek?

It is owned by the State Highway Agency.