US Bridges

SH 93 Ml over Coal Creek

Fair

Boulder County, Colorado · 3.5 MI No of JCT SH 72 · Structure no. E-15-O

Built
1965
60 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete
Length
36 ft
3 main spans
Daily traffic
16,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 93 Ml over Coal Creek is a concrete culvert carrying SH 93 Ml over Coal Creek in Boulder 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 16,000 vehicles a day, roughly 4% of them trucks, projected to reach 18,400 by 2040. The structure is 36 ft (11.1 m) long and 80 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesSH 93 Ml
CrossesCoal Creek
Location3.5 MI No of JCT SH 72
RouteState Highway 93A
Coordinates39.91681, -105.23784
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.5 US tons
Inventory rating51.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length36 ft (11.1 m)
Longest span14 ft (4.2 m)
Deck width80 ft (24.5 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,000 (2020)
Projected traffic18,400 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes

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 93 Ml over Coal Creek built?

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

What condition is SH 93 Ml over Coal 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 June 2024.

How much traffic does SH 93 Ml over Coal Creek carry?

About 16,000 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is SH 93 Ml over Coal Creek?

The structure is 36 ft (11.1 m) long with a longest span of 14 ft (4.2 m) and a deck 80 ft wide.

Who owns SH 93 Ml over Coal Creek?

It is owned by the State Highway Agency.