Ground depression prompts partial closure on Myrtle Street in downtown Boise

Map of Myrtle Closure

11:45 a.m. Oct. 8

During boring operations along Myrtle Street in downtown Boise, a depression formed in a travel lane, prompting a partial closure of the road.

Currently, the right-most lane of Myrtle Street is closed between 2nd and 4th Street. ITD crews are on site investigating the situation and developing a response. Motorists, bicyclists, and pedestrians are urged to use caution while traveling in the area.

Updates will be posted here as additional information comes in.

2:00 p.m. Oct. 8

Crews investigating the depression in the road have found the cause to be a void in the earth beneath the roadway. This void is estimated to be 3-4 feet deep, and 8-14 feet wide, or about the width of a single travel lane.

The boring work being done in the area is to relocate utilities. Idaho Power received a permit from ITD to complete the work.

The contractor (Idaho Power) will rip up the road surface to survey the extent of the  void. Generally speaking, the next steps for the contractor will be to fill in the void with appropriate material and repave the roadway.

4:00 p.m. Oct. 8

Crews have opened up the road to survey the extent of the void. It ended up being less severe than anticipated. The void was no deeper than 18 inches and extended 14 feet wide. The contractor will spend the rest of the day filling in the void and laying a temporary asphalt patch to restore the surface of the road to a smooth driving surface. ITD has directed this work to be complete by 4:00 a.m. October 9th.

ITD will work with the contractor to complete extensive repairs and lay durable asphalt down at a later date.

9:00 a.m. Oct. 9 (final update)

The contractor worked overnight to repair the damage and patch the road with temporary asphalt. The lane was open before the morning rush hour. The contractor is working with ITD to plan a permanent repair at a later date with minimal impact to traffic.

Property owners approve three of four proposed noise walls near I-84 expansion project in Canyon County

The Idaho TransportatioMap of proposed noise walls in Caldwelln Department has collected the votes and is making plans for three new noise walls along Interstate 84 as a part of a multi-year study of improvements in Canyon County.

ITD proposed four locations for noise walls. Those locations and the results of votes from those who would benefit from them are:

  • Along eastbound I-84 adjacent to the Indian Creek Estates – approved
  • Along the westbound on ramp at Franklin Road – approved
  • Along westbound I-84 between Centennial Way and 10th Ave. – approved
  • Along eastbound I-84 between Centennial Way and 10th Ave. – not approved

ITD invites members of the community to ask questions about the project on Oct. 17 at the Caldwell Best Western (908 Specht Ave.) anytime between 4:30 p.m. and 6:30 p.m.

“The decision whether or not to build noise walls belongs to those adjacent owners and residents who are shown to be affected by future traffic noise,” said ITD Transportation Program Manager Amy Schroeder. “ITD’s role is to model the change in noise levels to determine who is a benefited receptor, follow state and federal noise policies, and facilitate the decision-making process,.”

A noise analysis was conducted earlier this year to determine the increase in traffic noise from adding a third lane in each direction on I-84. The next step was to confirm whether noise walls would reduce sound by 5 decibels or more. Human speech ranges from 50 to 65 decibels; traffic noise ranges from 70 to 80 decibels.

The noise study also identified specific properties, or “receptors” that would benefit from mitigation measures such as a wall. These property owners were invited to vote on the walls through an extensive balloting process in July and August 2019. View a map of the receptors.

For a noise wall to be approved, ITD policy states that more than 50 percent of affected property owners must vote “yes.” If the property owner vote is 50 percent or fewer, then affected residents are invited to vote. Resident votes must be greater than 75 percent to overturn the owners’ “no” vote.

The walls will be designed using concrete panels between 12 feet and 16 feet tall.

ITD is investing more than $330 million into Interstate 84 in Canyon County over the next several years. More information about the I-84 expansion is available at and on the Drive Idaho podcast (available on all podcast players).

Graphical display of ITD's noise process

Interim signal to be constructed on Idaho Highway 55 at Brookside Lane

Intersection of ID-55 and Brookside currently without a signal

The Idaho Transportation Department has approved construction of a interim traffic signal at the intersection of Idaho Highway 55 and Brookside Lane to accomodate the Dry Creek Ranch development.

The signal, which will be paid for by the developer Boise Hunter Homes (BHH), is the next step in the development of Dry Creek Ranch. The Department is permitting this signal for the time being to accommodate the vehicles accessing Brookside Lane currently and in the near future. As the development continues to grow, ITD is requiring BHH to construct additional improvements and remove the signal. A similar agreement is in place for the Avimor development to the north.

“ITD’s long-range vision for this section of ID-55 requires the corridor to be free of signals north of Beacon Light,” said Amy Revis, District Engineer of ITD’s Southwest Idaho offices. “We often phase implementation of improvements to meet current and near-term traffic demand, allowing the development to generate revenues which can fund the ultimate mitigation improvements.”

ITD has an agreement with BHH and Ada County that improvements to ID-55 must be constructed at certain stages of growth. This is measured by the number of trips into the development during the evening rush hour. ITD collects the trip data annually. Currently, there are 100 trips per hour.

  • At 550 trips per hour, the developer must construct an additional travel lane in each direction on ID-55 from Beacon Light Road to a few hundred feet north of Brookside Ln.
  • At 1300 trips per hour, the developer must remove the signal and construct an alternate intersection that allows free-flowing traffic at 55 mph.

With the approval from ITD, BHH is now cleared to construct the signal. No exact timeline for construction has been provided to the Department.

ITD collaborates with developers and local governments to find balanced solutions that achieve the Department’s mission of “Your Safety. Your Mobility. Your Economic Opportunity.”

Intersection closures and girder placement on ID-55 in Marsing Oct. 1, 2019

crane places girders for bridge

Several intersections on Idaho 55 will be closed beginning Oct. 1. Construction crews are placing concrete gutters along the roadway. Access at each intersection’s will remain closed for 2-3 days (weather permitting) while the concrete hardens.

What to expect:

  • All work will be done during daytime hours.
  • Work is anticipated to take approximately two weeks to complete (weather permitting).
  • Work will be conducted between Bruneau Hwy. to Edwards St. on the north; Bruneau Hwy. to 9th St. on the south.
  • Side streets will be closed to all traffic while work is being done and while concrete hardens. Closures will be staggered.
  • Major intersections will be reduced down to one lane, but will remain open at all times. Steel plates will be placed over the gutter work while concrete hardens.

Flaggers will assist with the gutter operations at the major intersections.

The contractor will be placing the next set of girders tonight, Oct. 1. What to expect:

  • ID-55 and the Snake River Bridge will be closed for up to 30 minutes each time one of the girders are being placed.
  • Sunny Slope Road southbound will be reduced to one lane between Lowell and True roads. The lanes will be restricted from noon to 2:00 am each night to stage the bridge girders.
  • Work will generally be done between 10:00 pm and 2:00 am.
  • The work will be noisy.

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 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

New traffic pattern will take effect week of August 4 on westbound I-84 at Franklin Boulevard exit

Traffic on WB I-84 near the Franklin Blvd interchange

Ahead of constructing additional lanes on Interstate 84 in Canyon County, the Idaho Transportation Department is reconfiguring westbound lanes of the Interstate near the Franklin Blvd. interchange.

Currently, three westbound lanes are reduced to two lanes with the far left lane merging into the center lane. In the new configuration, the left lane will no longer merge, remaining a travel lane. The far right lane will end, used as the off-ramp to Franklin Blvd. A similar configuration is on westbound I-84 at the Garrity Blvd. interchange, where the Interstate is reduced from four to three lanes.

A graphic showing the new lane configuration of I-84 near Franklin Blvd.

“This reconfiguration maintains the existing capacity of I-84 during construction,” said ITD Project Manager Styles Salek. “With this change, we remind motorists to slow down, plan ahead and pay attention in construction zones.”

In order to promote the safety of motorists and construction crews, ITD has partnered with the Idaho State Police to provide enhanced patrols throughout the duration of the project.

This change will allow crews to begin adding lanes in the I-84 median between Karcher/Midland and Franklin Boulevard. The addition of lanes is part of the ongoing I-84 corridor project from Nampa to Caldwell. Improvements are expected to improve safety, address congestion and benefit the regional economy for many years.

For more information about the I-84, Karcher to Franklin project, listen to the Drive Idaho podcast, visit or text 555888 to request construction updates. You can also contact ITD at and (208) 334-8002.

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 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.