US Bridges

County Road 315 over Mamm Creek

Fair

Garfield County, Colorado · 5.2 MI South of I-70 · Structure no. GAR315-07.20-A

Built
1993
32 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
27 ft
1 main span
Daily traffic
181
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 315 over Mamm Creek is a concrete slab carrying County Road 315 over Mamm Creek in Garfield County, Colorado. It was built in 1993, so it is 32 years old, younger 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 181 vehicles a day, roughly 41% of them trucks, projected to reach 229 by 2042. The structure is 27 ft (8.1 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCounty Road 315
CrossesMamm Creek
Location5.2 MI South of I-70
RouteCounty Highway 0
CountyGarfield County
StateColorado
Coordinates39.46805, -107.68805
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating79.1 US tons
Inventory rating47.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length27 ft (8.1 m)
Longest span25 ft (7.6 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic181 (2023)
Projected traffic229 by 2042
Trucks41%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 County Road 315 over Mamm Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is County Road 315 over Mamm 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 September 2023.

How much traffic does County Road 315 over Mamm Creek carry?

About 181 vehicles per day (2023 count), of which roughly 41% are trucks.

How long is County Road 315 over Mamm Creek?

The structure is 27 ft (8.1 m) long with a longest span of 25 ft (7.6 m) and a deck 32 ft wide.

Who owns County Road 315 over Mamm Creek?

It is owned by the County Highway Agency.