US Bridges

NFSR 123 over N. Fork So. Platte Riv

Fair

Park County, Colorado · 3.1 MI NW of SH 285 · Structure no. 021211000001004

Built
1940
85 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
31 ft
1 main span
Daily traffic
10
2000 count
Owner
Federal
U.S. Forest Service

About this bridge

NFSR 123 over N. Fork So. Platte Riv is a wood or timber stringer/multi-beam or girder carrying NFSR 123 over N. Fork So. Platte Riv in Park County, Colorado. It was built in 1940, so it is 85 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 10 vehicles a day, projected to reach 20 by 2020. The structure is 31 ft (9.4 m) long and 15 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesNFSR 123
CrossesN. Fork So. Platte Riv
Location3.1 MI NW of SH 285
RouteFederal Lands Road 123
CountyPark County
StateColorado
Coordinates39.47557, -105.77225
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating27.4 US tons
Inventory rating21.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 20
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2000)
Projected traffic20 by 2020
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was NFSR 123 over N. Fork So. Platte Riv built?

It was built in 1940, making it 85 years old in 2025.

What condition is NFSR 123 over N. Fork So. Platte Riv 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 October 2023.

How much traffic does NFSR 123 over N. Fork So. Platte Riv carry?

About 10 vehicles per day (2000 count).

How long is NFSR 123 over N. Fork So. Platte Riv?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 15 ft wide.

Who owns NFSR 123 over N. Fork So. Platte Riv?

It is owned by the U.S. Forest Service.