US Bridges

SH 157 Ml over Skunk Creek

Fair

Boulder County, Colorado · In Boulder · Structure no. D-16-CS

Built
1978
47 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
43,000
2020 count
Owner
State
State Highway Agency

About this bridge

SH 157 Ml over Skunk Creek is a concrete culvert carrying SH 157 Ml over Skunk Creek in Boulder County, Colorado. It was built in 1978, so it is 47 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 5 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 43,000 vehicles a day, roughly 4% of them trucks, projected to reach 46,440 by 2040. The structure is 29 ft (8.7 m) long and 137 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesSH 157 Ml
CrossesSkunk Creek
LocationIn Boulder
RouteState Highway 157A
Coordinates40.01238, -105.24015
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.7 US tons
Inventory rating36.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length29 ft (8.7 m)
Longest span14 ft (4.2 m)
Deck width137 ft (41.7 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43,000 (2020)
Projected traffic46,440 by 2040
Trucks4%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 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 157 Ml over Skunk Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is SH 157 Ml over Skunk 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 July 2023.

How much traffic does SH 157 Ml over Skunk Creek carry?

About 43,000 vehicles per day (2020 count), of which roughly 4% are trucks.

How long is SH 157 Ml over Skunk Creek?

The structure is 29 ft (8.7 m) long with a longest span of 14 ft (4.2 m) and a deck 137 ft wide.

Who owns SH 157 Ml over Skunk Creek?

It is owned by the State Highway Agency.