US Bridges

Fdr 520I over Rio Grande River

Fair

Hinsdale County, Colorado · 1 MI on Fdr 520I · Structure no. 020905000001176

Built
1966
59 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
109 ft
3 main spans
Daily traffic
14
2003 count
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 520I over Rio Grande River is a wood or timber stringer/multi-beam or girder carrying Fdr 520I over Rio Grande River in Hinsdale County, Colorado. It was built in 1966, so it is 59 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 14 vehicles a day, projected to reach 10 by 2020. The structure is 109 ft (33.2 m) long and 13 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesFdr 520I
CrossesRio Grande River
Location1 MI on Fdr 520I
RouteFederal Lands Road 520.2
Coordinates37.77442, -107.14124
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating21.8 US tons
Inventory rating16.8 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 10
Structure length109 ft (33.2 m)
Longest span36 ft (11 m)
Deck width13 ft (4 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14 (2003)
Projected traffic10 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$95,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Fdr 520I over Rio Grande River built?

It was built in 1966, making it 59 years old in 2025.

What condition is Fdr 520I over Rio Grande River 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 Fdr 520I over Rio Grande River carry?

About 14 vehicles per day (2003 count).

How long is Fdr 520I over Rio Grande River?

The structure is 109 ft (33.2 m) long with a longest span of 36 ft (11 m) and a deck 13 ft wide.

Who owns Fdr 520I over Rio Grande River?

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