SH 21 over Mores Cr; Dunnigan CR
GoodBoise County, Idaho · 12.4 E. Boise · Structure no. 000000000012826
- Built
- 2008
- 17 years old
- Condition
- Good
- inspected October 2022
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 113 ft
- 1 main span
- Daily traffic
- 2,900
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SH 21 over Mores Cr; Dunnigan CR is a prestressed concrete stringer/multi-beam or girder carrying SH 21 over Mores Cr; Dunnigan CR in Boise County, Idaho. It was built in 2008, so it is 17 years old, younger than the Idaho average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 2,900 vehicles a day, roughly 5% of them trucks, projected to reach 4,350 by 2042. The structure is 113 ft (34.4 m) long and 55 ft wide. If it were closed, the detour would be 34.8 mi (56 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 21 over Mores Cr; Dunnigan CR built?
It was built in 2008, making it 17 years old in 2025.
What condition is SH 21 over Mores Cr; Dunnigan CR in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2022.
How much traffic does SH 21 over Mores Cr; Dunnigan CR carry?
About 2,900 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is SH 21 over Mores Cr; Dunnigan CR?
The structure is 113 ft (34.4 m) long with a longest span of 111 ft (33.8 m) and a deck 55 ft wide.
Who owns SH 21 over Mores Cr; Dunnigan CR?
It is owned by the State Highway Agency.