US Bridges

Nisula Road over Mud Creek

Poor

Valley County, Idaho · 2.0 N. 2.0 W. Donnelly · Structure no. 000000000028570

Built
1986
39 years old
Condition
Poor
inspected August 2024
Type
Culvert
Steel
Length
41 ft
4 main spans
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Nisula Road over Mud Creek is a steel culvert carrying Nisula Road over Mud Creek in Valley County, Idaho. It was built in 1986, so it is 39 years old, younger than the Idaho average of 45.3 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2039. The structure is 41 ft (12.5 m) long and 50 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNisula Road
CrossesMud Creek
Location2.0 N. 2.0 W. Donnelly
RouteCounty Highway 0
CountyValley County
StateIdaho
Coordinates44.76036, -116.11753
Functional classRural Local

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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 12 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 geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans4
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span7 ft (2.1 m)
Deck width50 ft (15.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2039
Trucks10%
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 statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$380,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nisula Road over Mud Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is Nisula Road over Mud 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 August 2024.

How much traffic does Nisula Road over Mud Creek carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Nisula Road over Mud Creek?

The structure is 41 ft (12.5 m) long with a longest span of 7 ft (2.1 m) and a deck 50 ft wide.

Who owns Nisula Road over Mud Creek?

It is owned by the County Highway Agency.