US Bridges

County Road Mm over Unnamed Drain

Poor

Prowers County, Colorado · 0.1 MI E of CR 8 · Structure no. PRMM-7.1-34-22

Built
1975
50 years old
Condition
Poor
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
30 ft
1 main span
Daily traffic
314
2022 count
Owner
County
County Highway Agency

About this bridge

County Road Mm over Unnamed Drain is a steel stringer/multi-beam or girder carrying County Road Mm over Unnamed Drain in Prowers County, Colorado. It was built in 1975, so it is 50 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.

It carries about 314 vehicles a day, roughly 2% of them trucks, projected to reach 373 by 2042. The structure is 30 ft (9.1 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Road Mm
CrossesUnnamed Drain
Location0.1 MI E of CR 8
RouteCounty Highway 0
CountyProwers County
StateColorado
Coordinates38.14323, -102.61127
Functional classRural Minor Collector

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating52.5 US tons
Inventory rating31.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span28 ft (8.5 m)
Deck width26 ft (8 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic314 (2022)
Projected traffic373 by 2042
Trucks2%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$67,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road Mm over Unnamed Drain built?

It was built in 1975, making it 50 years old in 2025.

What condition is County Road Mm over Unnamed Drain 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 April 2023.

How much traffic does County Road Mm over Unnamed Drain carry?

About 314 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is County Road Mm over Unnamed Drain?

The structure is 30 ft (9.1 m) long with a longest span of 28 ft (8.5 m) and a deck 26 ft wide.

Who owns County Road Mm over Unnamed Drain?

It is owned by the County Highway Agency.