US Bridges

SH 59 Ml over Six Mile Creek

Poor

Phillips County, Colorado · 35.1 MI N of JCT US 34 · Structure no. B-26-E

Built
1948
77 years old
Condition
Poor
inspected May 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
114 ft
5 main spans
Daily traffic
220
2020 count
Owner
State
State Highway Agency

About this bridge

SH 59 Ml over Six Mile Creek is a wood or timber stringer/multi-beam or girder carrying SH 59 Ml over Six Mile Creek in Phillips County, Colorado. It was built in 1948, so it is 77 years old, older than the Colorado average of 42.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 220 vehicles a day, roughly 23% of them trucks, projected to reach 273 by 2040. The structure is 114 ft (34.8 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSH 59 Ml
CrossesSix Mile Creek
Location35.1 MI N of JCT US 34
RouteState Highway 59B
Coordinates40.55678, -102.62672
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.1 US tons
Inventory rating25.5 US tons

Structure

MaterialWood or Timber
DeckCorrugated steel
Main spans5
Design loadH 20
Structure length114 ft (34.8 m)
Longest span23 ft (7 m)
Deck width26 ft (7.9 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic220 (2020)
Projected traffic273 by 2040
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 59 Ml over Six Mile Creek built?

It was built in 1948, making it 77 years old in 2025.

What condition is SH 59 Ml over Six Mile Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.

How much traffic does SH 59 Ml over Six Mile Creek carry?

About 220 vehicles per day (2020 count), of which roughly 23% are trucks.

How long is SH 59 Ml over Six Mile Creek?

The structure is 114 ft (34.8 m) long with a longest span of 23 ft (7 m) and a deck 26 ft wide.

Who owns SH 59 Ml over Six Mile Creek?

It is owned by the State Highway Agency.