I-84 in Nampa will be detoured overnight Sept. 16-19 for work on Karcher Overpass

Karcher Overpass under Construction

Interstate 84 will be closed overnight between the Karcher/Midland and Northside interchanges on Monday, Sept. 16 through Thursday, Sept. 19. The closures will allow crews to safely remove the wooden forms that temporarily supported the new bridge deck this summer.

  • Westbound I-84 will be closed for two nights – Sept. 16 and Sept. 17. Each night I-84 will be closed from 10 p.m. to 6 a.m.
  • Eastbound I-84 will be closed for two nights – Sept. 18 and Sept. 19. Each night I-84 will be closed from 10 p.m. to 5 a.m.

During the four overnight closures, motorists will exit I-84 at Karcher/Midland or Northside and follow a detour along Karcher Road. Flaggers will direct traffic. View the detour map.

Lane restrictions and flaggers will also be in place on the Northside Boulevard between the ramps each night while crews begin to work on the new bridge.

The new Karcher Overpass is on schedule to re-open later this fall. Reconstruction of the Northside Interchange has begun and will continue through early 2021.

For more information about the reconstruction of I-84 in Canyon County, visit itdprojects.org/84Corridor. To receive construction updates; text 84corridor to 555888. “Drive Idaho,” ITD’s new podcast series on all things I-84 in Canyon County, is available for download on Spotify and Apple Podcast and other major podcast sharing sites.

ID-55 Snake River Bridge overnight closures during girder placement

ID-55 bridge with american flag in foreground

There will be temporary closures on Idaho Highway 55 at the Snake River Bridge in Marsing while girders are placed for the new bridge.

Girders are large horizontal beams that support the surface of the bridge. Each girder weighs 141,000 pounds and is 148 feet long. Current plans call for girders to be placed overnight on Tuesday Sept. 3, Thursday Sept. 5, Friday Sept. 13, and Monday Sept. 16. This is subject to change.

Sunny Slope Rd. southbound will be reduced to one lane between Lowell and True road. The lanes will be restricted from noon to 2:00 am each night to stage the bridge girders. Placement of the girders will generally occur between the hours of 10:00 pm and 2:00 am. Traffic will be stopped for up to thirty minutes while each girder is placed. Each night up to three girders will be placed.

This work is part of a two year-long project to replace the Snake River Bridge in Marsing The project will improve safety and driving conditions on the bridge, which is the primary river crossing for the area. More information can be found at https://itdprojects.org/marsing55improvements/.

Westbound I-84 Karcher/Midland Rd Exit 33 to close overnight July 26

I-84 looking west towards exit 33 in Nampa

The Idaho Transportation Department has scheduled an overnight closure for the westbound I-84 off-ramp at the Karcher/Midland Interchange on Friday, July 26. The planned closure will allow crews to pave the ramp as part of ongoing improvements to widen I-84 from Nampa to Caldwell.

The off-ramp will be closed from 10 p.m. July 26 to 7 a.m. July 27. Motorists seeking access to Karcher Road or Midland Boulevard from westbound I-84 will need to use the Northside Boulevard exit and follow posted detour signs. See a map of the detours below.

Detour map for WB Exit 33 closure

Overnight closures on I-84 are part of ITD’s large-scale project geared towards improving the I-84 corridor between Nampa and Caldwell.  The work is expected to improve safety, address congestion and benefit the regional economy for many years.

For more information about I-84 in Canyon County, listen to the Drive Idaho podcast or visit ITDprojects.org/84corridor. To request construction updates right to your cell phone, text 84CORRIDOR to 555888.

Construction of ID-55 improvements in Marsing to impact July 3rd celebrations

Construction in Marsing will impact the July 3 Fireworks Extravaganza

The Idaho Transportation Department is issuing a travel advisory on Idaho Highway 55 near Marsing for July 3, 2019.

Construction to rebuild ID-55 through downtown Marsing and the bridge over the Snake River will impact travel around the City of Marsing’s annual July 3rd Fireworks Extravaganza at Marsing Island Park. Traffic will be reduced to a single lane on the highway north of the bridge and in town. No left-turns will be allowed in town during the event.

The Snake River Bridge is closed to pedestrians and bicyclists. The City of Marsing has arranged for a free shuttle service to and from the event. Please see the event map below for details.

July 3rd Marsing Map

ITD encourages those planning to attend the event consider using U.S. 95 to reach Marsing. Consider carpooling to alleviate congestion as over 5,000 visitors are expected to arrive for the celebration. Plan extra time for the return trip. Please exercise patience and kindness as you leave.

ITD reminds those who will be drinking during the event to make a plan in advance to get home safe. The Department is partnering with law enforcement to increase DUI patrols during the Fourth of July week.

ITD lowers speed limit on I-84 in Caldwell to 65 MPH

I-84 speed limit reduction in Caldwell

Following a speed study of I-84 in the urbanized parts of the Treasure Valley, the Idaho Transportation Department (ITD) is reducing the speed limit on the western side of Caldwell to 65 MPH.

The current speed limit on I-84 traveling west goes from 65 MPH to 80 MPH after the Notus/Parma Exit (Exit 26). Due to the high number of vehicles using Middleton Exit (Exit 25) both east- and westbound coupled with varying speeds of thru traffic and merging vehicles, the Department determined a speed reduction was warranted. The 65 MPH speed zone will now extend west of Exit 25. Crews will place new speed limit signs today.

“We observed significant variations in speeds, with entering traffic speeding up to merge with I-84 traffic, which was slowing for the speed limit change,” said ITD Traffic Technical Engineer Erika Bowen. “This resulted in a number of near misses between cars on the Interstate and those looking to enter. Given the high demand at the Middleton Exit, we believe the change will improve the driving conditions in this area.”

ITD routinely studies sections of the State Highways System to ensure the safety, mobility, and economic opportunity of the traveling public is best served. Staff looks at the pavement condition, crash history, geometry, signage, and observed driver behavior when considering changes to the highway.

Over the last five years, growth near the Middleton Exit has seen an increase of 5,000 vehicles per day added to this section of I-84. During the evening commute, congestion often occurs at Exit 25 causing backups on the westbound off-ramps. ITD is looking at solutions for this separate situation to improve the efficiency of the interchange.

Update: I-84 closed overnight June 10, 11 and 12 for girder placement at Karcher Overpass

Karcher Overpass bridge under construction

UPDATE (June 11)

I-84 detours in Nampa have been extended due to equipment-related delays during the Karcher Overpass girder placement. A detour will be in place Tuesday and Wednesday nights (June 11 and 12) between the Karcher/Midland and Northside Boulevard interchanges.

  • Eastbound I-84 will be closed overnight Tuesday, June 11.  A detour will begin at 10 p.m. Tuesday and end at 5 a.m. Wednesday, June 12.
  • Westbound I-84 will be closed overnight Wednesday, June 12. A detour will begin at 10 p.m. Wednesday and end at 6 a.m. Thursday, June 13.

Original Story (June 4)

ITD will require overnight closures on Interstate 84 in Nampa next Tuesday and Wednesday nights (June 10 and 11) to place girders on the new Karcher Road Overpass.

  • Eastbound I-84 will be closed overnight Monday, June 10. A detour will begin at 10 p.m. Monday and end at 5 a.m. Tuesday, June 11.
  • Westbound I-84 will be closed overnight Tuesday, June 11. A detour will begin at 10 p.m. Tuesday and end at 6 a.m. Wednesday, June 12.

Motorists will follow a detour route on Karcher Road both nights. See detour map below.

Detour map of I-84 in Nampa

“ITD will place 10 steel girders over the two nights. Each girder is 136 feet long and weighs approximately 115,670 pounds,” said Alex Deduck, ITD Design/Construction Engineer.  “This is no small operation and we appreciate the patience of the traveling public during the detour.”

ITD is replacing the Karcher Overpass to accommodate additional lanes on I-84. Construction to widen I-84 will begin later this summer.

For more information, visit itdprojects.org/84Corridor, text 84CORRIDOR to 22828 or listen to “Drive Idaho,” ITD’s new podcast series on I-84. Drive Idaho is available on Apple Podcasts, Spotify and other major podcast players.

Memorial Day Travel Advisory for Treasure Valley residents

Traffic Congestion Generic

Memorial Day weekend is nearly upon us, and ITD is issuing the follow travel advisory to inform those planning to drive from the Boise area of conditions on and along the area highways.

Construction Impacts

Interstate 84

There are two projects active on I-84 to the east and west of the Boise area.

Bridge rehabilitation on the bridge over Purple Sage Road west of Caldwell has reduced the Interstate to a single lane in each direction. Speed limits are reduced and motorists should anticipate delays.

Pavement rehabilitation and construction of a third westbound lane are active east of Mountain Home. Motorists will be channeled into a single lane and speed limits are reduced.

U.S. 95

There are two construction projects that will have active impacts over the weekend. Both are bridge replacements that currently have only one travel lane. The first project is located approx. 10 miles north of Council. The second is the Little Rainbow Bridge, approx. 13 miles north of New Meadows. Both construction zones are controlled by temporary signals. Motorists should anticipate delays on this route.

Idaho Highway 55

One active project on ID-55 is the repavement of the highway south of Smiths Ferry. Work will be suspended starting Friday, May 24 and not resume until Tuesday, May 28. Motorists should use caution in the area and obey traffic signs. There will be uneven surfaces as the project remains partially constructed.

Another project on ID-55 in Canyon County is the bridge and road reconstruction in Marsing. Construction impacts will remain active over the weekend. Travel will be reduced to one lane in each direction. Motorists should expect delays in the area.

Travel Conditions

Prolonged rainfall and cooler temperatures mean the mountains are saturated. This increases the risk of rockfall and mudslides. Motorists should be aware of the possibility of hazards on the road and drive with caution. Remember to remove distractions and Drive Well, focusing on the important task of engaged driving.

Congestion is common on these mountain highways during summer holidays. In particular, the intersection of ID-55 and Banks-Lowman Road sees heavy traffic. To mitigate this increase, ITD will flag this intersection on Memorial Day, the Fourth of July, and Labor Day.

ITD is encouraging vehicles traveling from the Sun Valley region to the Boise area consider alternate routes or travel outside the busiest times (noon to early evening) to avoid delays at the intersection of ID-55 and Banks-Lowman Rd.

Be sure to check 511 before leaving to see the latest road conditions and impacts. You can call, visit the website, or download the app for Apple or Android devices.

I-84 will be detoured overnight May 22-23 for utility work

A line of power poles ready for electrical wires

Interstate 84 will be closed between the Karcher/Midland and Northside interchanges from 10 p.m. Wednesday, May 22 to 5 a.m. Thursday, May 23 to remove power lines above the highway.

A detour route will be in place. Motorists will exit I-84 at the interchanges and follow a detour along Karcher Road. Flaggers will direct traffic. Detour map below.

I-84 detour map for may 22, 2109

The power lines are being removed in preparation of ITD’s plans to begin widening I-84 in this area. The closures will be rescheduled in the case of inclement weather.

For more information, visit itdprojects.org/84Corridor. To receive construction updates; text 84corridor to 22828. Drive Idaho, ITD’s new podcast series on all things I-84 in Canyon County, is available for download on Spotify, iTunes, Google Play Music and other major podcast sharing sites.

I-84 will be detoured overnight April 22-26 for Idaho Power transmission line work in Caldwell

A power pole without a line

Interstate 84 will be closed at night between the Franklin Road and Karcher/Midland interchanges April 22-26 while Idaho Power installs a new transmission line across the interstate. A detour will be in place each night between 10 p.m. and 5 a.m.

The detour route will follow Franklin Road (US-20/26) and Midland Road. Please plan ahead and expect delays when traveling in the area. Flaggers will direct traffic.

Idaho Power is installing a new transmission line across I-84. The transmission line will serve the new Skyway Ranch Substation east of the Franklin Road Interchange.

Detour map for I-84 overnight closures
Detour map for I-84 overnight closures April 22-26, 2019

Traffic reduced over Snake River Bridge in Marsing

A crane looms over a bridge

The Snake River Bridge will be reduced to one lane beginning Tuesday, April 9 in preparation for rebuilding the bridge.

What to expect at the Snake River Bridge:

  • Temporary traffic signals will be placed on both sides of the bridge to direct traffic.
  • Motorists should expect delays of up to 15 minutes.
  • The speed limit on the bridge will be reduced from 35 mph. to 25 mph.

The lane and the speed reductions on the Snake River Bridge will remain in effect until the bridge rebuild is complete. ITD will begin reconstructing the north side of ID-55 on April 9. Traffic will be switched to the south side of ID-55 in downtown Marsing while crews begin to reconstruct the north side of ID-55.

What to expect on ID-55:

  • Work will occur between 4th Avenue and Riverfront.
  • Work will occur during daytime hours.
  • Temporary traffic signals will direct traffic. Expect delays of up to 15 minutes.
  • Driveway access will remain open with brief delays.

Pedestrians are encouraged to use the south side of ID-55.