Overview
Crews are constructing improvements to SH-75 between Elkhorn Road and River Street in Ketchum. Continue reading to learn more.
Work resumed on the Trail Creek Bridge in early February
Crews resumed work to improve and expand the Trail Creek Bridge on Monday, February 2, 2026. Work to expand SH-75 between Elkhorn Road and River Street is scheduled to resume this spring.
Southbound SH-75 detour
Beginning Thursday, February 19, southbound SH-75 will be closed between Emerald Street and Andora Lane.
All traffic north of Emerald Street will travel northbound on SH-75. Motorists looking to head south will detour to River Street, 2nd Avenue and Serenade Lane. Click here to view a detour map.
This detour will allow crews to work on a structural wall on the west side of the road and is expected to remain in place for a couple of months.
Changes at SH-75 and Serenade Lane
Changes have been made at the intersection of SH-75 and Serenade Lane to improve traffic flow.
- The stop sign on Serenade Lane has been removed to create a free-running right turn onto SH-75. A stop sign has been added to southbound SH-75 at the intersection with Serenade Lane.
- The stop sign on 2nd Avenue has been removed to create a free-running left turn onto Serenade Lane. A stop sign has been added to eastbound Serenade Lane at the intersection with 2nd Avenue.
Click here to view a map of current signage.
Pedestrian safety at the Trail Creek Bridge
Pedestrians can safely cross the Trail Creek Bridge on the east side of the roadway. Pedestrians on the west side of SH-75 will be directed to a pedestrian crossing near Andora Lane.
Click here to view a pedestrian detour map.
What to expect in 2026:
- Work will occur Monday-Sunday during the daytime.
- Southbound Trail Creek Bridge traffic will be detoured to 2nd Avenue. Click here to view a detour map.
- Traffic changes will occur on SH-75 and local roads.
- One lane is expected to remain open in each direction on SH-75 between Elkhorn Road and the Trail Creek Bridge.
- Speed limits will be reduced.
In 2026, crews will:
- Construct the west half of the Trail Creek Bridge.
- Complete improvements to the intersection of SH-75 and Elkhorn Road.
- Complete improvements to SH-75 between Elkhorn Road and Weyyakin Drive.
- Widen SH-75 between Weyyakin Drive and River Street.
- Construct improvements to the intersection of SH-75 and Serenade Lane.
Work hours
Work hours have been extended to complete the Elkhorn Road to River Street project as safely and quickly as possible. This change was made with the approval of the cities of Ketchum and Sun Valley.
Work is expected to occur:
- Monday-Friday from 6:00 a.m.-10:00 p.m.
- Saturdays from 7:30 a.m.-7:00 p.m.
- Sundays from 8:00 a.m.-7:00 p.m.
Improvements
ITD is constructing several improvements to SH-75 between Elkhorn Road and River Street. These improvements include:
- Widening SH-75 to five lanes between Elkhorn Road and Serenade Lane.
- Widening SH-75 to three lanes with bike lanes and sidewalks between Serenade Lane and River Street, including on the Trail Creek Bridge.
- Upgrading the traffic signal at the SH-75/Elkhorn Road intersection.
- Installing a traffic signal at the SH-75/Serenade Lane intersection.
- Improving some local roads, including Serenade Lane and Elkhorn Road.
- Click here to view detailed improvement plans.
Process & Schedule
-
Spring 2025 – Summer 2025
Crews constructed:
- The northbound lanes of SH-75 from south of Elkhorn Road to Serenade Lane.
- Utility relocations and retaining walls between Serenade Lane and River Street.
-
Summer 2025 – Late 2025
Crews constructed:
- The southbound lanes of SH-75 from south of Elkhorn Road to Serenade Lane.
- The northbound side of the Trail Creek Bridge.
- Utility relocations and retaining walls between Serenade Lane and River Street.
-
2026
Crews will construct:
- SH-75 between Neil’s Way and River Street.
- The southbound side of the Trail Creek Bridge.
- Improvements to the intersection of SH-75 and Elkhorn Road.
- Improvements to the intersection of SH-75 and Serenade Lane.
Crews will also complete improvements to SH-75 between Elkhorn Road and Neil’s Way.
Impacts to Local Roads
A short-term closure occurred on Weyyakin Drive where it intersects with SH-75 in 2025. The project team does not anticipate additional traffic impacts on Weyyakin Drive.
Click here to sign up for updates during construction.
Crews plan to maintain access to Lane’s Way during construction.
The sidewalk on the east side of SH-75 closed between Lane’s Way and Elkhorn Road in 2025.
Click here to sign up for updates during construction.
Elkhorn Road may be reduced to one lane in each direction with traffic shifts through 2026 near where it intersects with SH-75. The roadway may be intermittently reduced to one lane with flaggers directing traffic.
The sidewalk on the east side of SH-75 closed between Lane’s Way and Elkhorn Road in 2025.
Click here to sign up for updates during construction.
River Street will be reduced to one lane heading westbound between SH-75 and Washington Avenue for several weeks in 2026.
Click here to sign up for updates during construction.
A short-term closure will occur at the intersection of Gem Street and SH-75 in 2026. Traffic will be detoured to Leadville Avenue and River Street.
Click here to sign up for updates during construction.
Left turns will be temporarily restricted for motorists turning onto or off Serenade Lane at SH-75 in 2026.
A short-term closure will occur on Serenade Lane between summer and late fall of 2026. The closure will occur at the SH-75/Serenade Lane intersection. Traffic will be detoured to SH-75, River Street and 2nd Avenue.
Click here to sign up for updates during construction.
Stay informed
To stay informed about the SH-75 Elkhorn Road to River Street project and sign up for updates:
- Click here
- Email: info@sh75project.com
- Call: (208) 254-0421
Frequently Asked Questions
In 2008, ITD published the SH-75 Timmerman to Ketchum Environmental Impact Statement and Record of Decision, which documented a study of SH-75 between the Timmerman Junction (at US-20) and Ketchum. The outcomes of the 2008 Environmental Impact Statement were re-evaluated between 2019-2024. During this process, ITD used traffic projections, safety data, community input and more to confirm final improvements.
ITD developed project plans to improve safety and increase capacity in order to accommodate traffic projections for the next 20 years.
- SH-75 will be reduced to one lane in each direction from south of Elkhorn Road to River Street.
- The Trail Creek Bridge will be reduced to one lane heading northbound for several weeks.
- Short-term impacts will occur on local roads.
- Traffic patterns may change at the intersection of SH-75 and Elkhorn Road and the intersection of SH-75 and Serenade Lane.
- Pedestrian access will be limited between Andora Lane and River Street as well as on the Trail Creek Bridge in 2026.
- The Sun Valley Pathway will remain open during construction.
- The New Spur Trail is scheduled to close for a few weeks in 2026.
No, this project does not include improvements to the River Street intersection.
If your questions are about ITD’s decision-making process during the design of this project, click here to view design FAQs.
If you’d like to speak with a member of the project team:
- Email: info@sh75project.com
- Call: (208) 254-0421
SH-75 is the primary north-south highway in the Wood River Valley serving the cities of Bellevue, Hailey, Ketchum and Sun Valley in Blaine County.