Devil's Gate Reservoir Restoration Project

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PROJECT DESCRIPTION

The Devil's Gate Reservoir Restoration Project is a four-year effort to increase flood protection for communities downstream of Devil's Gate Dam and restore habitat within a popular section of the Arroyo Seco Watershed.

Los Angeles County Public Works will remove 1.7 million cubic yards of sediment from the reservoir immediately behind the nearly 100-year-old dam. In addition to providing flood relief to communities that have endured nearly a decade of elevated flood risk along the Arroyo Seco, the project will establish a permanent stormwater maintenance area that allows for the creation of 70 acres of enhanced habitat and recreational opportunities for local communities.

Update: 11/1/19

Notice: No Hauling this Friday, November 1, 2019

LA County Public Works appreciates the community’s patience with the Devil’s Gate Reservoir Restoration Project. There will be no hauling operations tomorrow, November 1, 2019. Hauling operations are anticipated to resume Monday, November 4.

The project team thanks you for your patience.

Update: 10/28/19

Notice: Notice: No Hauling this Monday, October 28, 2019 through Thursday, October 31, 2019

The National Weather Service has issued a Red Flag Warning for this Wednesday and Thursday due to gusty winds and very low humidity. A Red Flag Warning means that critical fire weather conditions are expected. There will be no hauling operations on Monday, October 28 through Thursday, October 31. Hauling operations are anticipated to resume on Friday, November 1.

The project team thanks you for your patience.

Update: 10/23/19

Notice: No Hauling this Thursday, October 24, 2019 and Friday, October 25, 2019

The National Weather Service has issued a Red Flag Warning for this Thursday and Friday due to gusty winds and very low humidity. A Red Flag Warning means that critical fire weather conditions are expected. Therefore, there will be no hauling operations on Thursday, October 24 and Friday, October 25. Hauling operations will resume Monday, October 28.

The project team thanks you for your patience.

Update: 10/9/19

Notice: No Hauling this Thursday, October 10, 2019 or Friday, October 11, 2019

The National Weather Service has issued a Red Flag Warning for this Thursday and Friday due to gusty winds and very low humidity. A Red Flag Warning means that critical fire weather conditions are expected. Therefore, there will be no hauling operations on Thursday, October 10 or Friday, October 11. Hauling operations will resume Monday, October 14.

The project team thanks you for your patience.

Update: 9/30/19

Notice: Hauling to resume Monday, September 30, 2019

LA County Public Works is dedicated to being a good neighbor and taking a community-first approach in its implementation of the Devil’s Gate Reservoir Restoration Project.

Due to dust and mud that was observed on the tires of trucks leaving the reservoir, Public Works took the proactive step of suspending hauling operations on September 5. To address these issues, a comprehensive plan was developed and implemented, which includes adding a second tire wash and other measures to significantly reduce the dust being tracked onto streets.

Hauling operations will resume Monday, September 30. Starting Monday, sediment will be hauled to Vulcan Materials Company’s Sheldon Pit in Sun Valley. Public Works will partner with the South Coast Air Quality Management District to closely monitor the streets to ensure all dust issues have been resolved.

We encourage community members to contact us immediately if they observe dust or have any other concerns regarding the hauling operation. Please contact us at (626) 458-2507 or the South Coast Air Quality Management District hotline at (800) CUT-SMOG.

The project team thanks you for your patience.

Update: 9/25/19

Notice: Public Works studies benefits of tarped haul trucks

LA County Public Works is dedicated to being a good neighbor and taking a community-first approach in its implementation of the Devil’s Gate Reservoir Restoration Project.

To determine the effectiveness of tarping all loaded haul trucks, Public Works initiated a pilot program that began August 19, 2019, in which both tarped and non-tarped trucks were followed and dust levels monitored and recorded. Results of the Tarping Pilot Program are available on the project website: Tarping Pilot Program Results.

Update: 9/12/19

Notice: Public Works studies benefits of tarped haul trucks

LA County Public Works is dedicated to being a good neighbor and taking a community-first approach in its implementation of the Devil’s Gate Reservoir Restoration Project.

To determine the effectiveness of tarping all loaded haul trucks, Public Works initiated a pilot program that began August 19, 2019, in which both tarped and non-tarped trucks were followed and dust levels monitored and recorded. Results of the Tarping Pilot Program are available on the project website: Tarping Pilot Program Results.

Update: 9/5/19

Notice: Hauling temporarily suspended due to ongoing dust issues

LA County Public Works is dedicated to being a good neighbor and taking a community-first approach in its implementation of the Devil’s Gate Reservoir Restoration Project. Although additional measures have been put in place to address dust and other issues, project managers are still observing dust on the tires of trucks exiting the work site. We are, therefore, suspending operations temporarily until a comprehensive plan to address dust has been developed and implemented.

The project team thanks you for your patience during this process.

Update: 8/29/19

Notice: No hauling this Friday, August 30, 2019 or next Monday, September 2, 2019

LA County Public Works appreciates the community’s patience with the Devil’s Gate Reservoir Restoration Project. In an effort to reduce traffic impacts leading into the holiday weekend, there will be no hauling operations on Friday, August 30 or Monday, September 2. Enjoy your long holiday weekend!

Update: 8/26/19

Notice: No hauling today, August 26, 2019, due to Brush Fire near the 134/2 Freeways

A brush fire broke out late Sunday afternoon in the Eagle Rock area resulting in a closure of portions of the 134 and 2 Freeways. As of 8 p.m. Sunday evening, spread of the fire was stopped in all directions with the size held to approximately 30 acres and containment at 25%. Due to the late start of the fire, unknown additional impacts, and the close proximity to the Devil’s Gate Reservoir Restoration Project site, LA County Public Works has determined there will be no hauling today, Monday, August 26, 2019. Public Works will continue to evaluate the status of the brush fire to determine when it is safe for hauling operations to resume.

For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.

Update: 8/15/19

Notice: Temporary change to haul routes today due to signal outage at Oak Grove Dr. and Berkshire Pl.

At approximately 8:45 a.m. this morning, a power outage unrelated to the project caused the traffic signal at Oak Grove Drive and Berkshire Place to go out. Public Works notified the appropriate parties. Following the newly revised haul route schedule, effective today, haul trucks would have started traveling to Berkshire Place to get onto the 210 Freeway at 9 a.m. However, in an abundance of caution due to the signal at that intersection being non-operational, haul trucks continued to travel to Windsor Avenue for a short period of time until the signal at Berkshire Place was back up and confirmed to be operational. The haul trucks then switched to follow the approved route towards Berkshire Place.

For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.

Update: 8/12/19

Notice: Tire wash installation begins today, August 12, 2019

Los Angeles County Public Works has started working today, August 12, 2019, on the installation of a tire wash at the haul truck exit of the Devil’s Gate Reservoir Restoration Project. This work, which has been approved by the City of Pasadena, includes constructing a temporary asphalt pavement extending from the newly constructed west access road to allow for the installation of a tire wash on a flat surface.

Utilizing a tire wash system at this location will remove dirt from the haul trucks’ tires and undercarriages before the trucks exit the project site, greatly reducing the amount of dirt tracked onto public roadways. After the haul trucks go through the tire wash, there will be a paved surface to allow the tires to dry before exiting the project site onto Oak Grove Drive. Implementing this additional measure in parallel with the other dust mitigation measures already employed on the project site will:

  • Reduce or eliminate the amount of visible dust tracked onto the roadway.
  • Further reduce the amount of airborne particulate matter from Project activities.
  • Reduce the utilization of a water truck on the roadway.
  • Reduce the frequency of street sweeping necessary, thereby extending the life of the existing pavement.
  • Conserve water by utilizing recirculated water inside the tire wash system.

For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.

Update: 8/7/19

Notice: New haul route schedule begins Thursday, August 15, 2019.

Beginning Thursday, August 15, LA County Public Works will transition to the newly adjusted In-School haul route:

  • From 7 a.m. – 9 a.m., all haul trucks accessing the Project Site will exit the I-210 Freeway using Arroyo Blvd./Windsor Ave., turn left onto Oak Grove Dr. and enter the Project Site. All trucks hauling sediment away from the Project Site will travel on Oak Grove Dr. back to Windsor Ave. to enter the I-210 Freeway either eastbound to Irwindale or westbound to Sun Valley.
  • From 9 a.m. – 2:30 p.m., all trucks accessing the Project Site will exit the I-210 Freeway using Arroyo Blvd./Windsor Ave., turn left onto Oak Grove Dr. and enter the Project Site. All trucks hauling sediment away from the Project Site will turn right onto Oak Grove Dr. to Berkshire Pl. to enter the I-210 Freeway either eastbound to Irwindale or westbound to Sun Valley.
  • From 2:30 p.m. – 3:30 p.m., all haul trucks will follow the same route as the 7 a.m. – 9 a.m. period, exiting and entering the I-210 Freeway using Arroyo Blvd./Windsor Ave.

The In-School haul route avoids school traffic in the morning during drop-offs and in the afternoon during pick-ups. Together, the In-School and Summer haul routes balance truck traffic between the communities of Pasadena and Altadena on the east side of the reservoir and La Cañada Flintridge on the west side. An overview of the haul routes is shown in a video on the project website here. For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.

Update: 6/6/19

Notice: Summer haul route begins Thursday June 6, 2019 and ends mid-August.

Beginning Thursday, June 6, LA County Public Works will transition to the Summer haul route with all haul trucks accessing the I-210 Freeway using Berkshire Place/Oak Grove Drive in La Cañada Flintridge. The Summer haul route will balance truck traffic between the communities of Pasadena and Altadena on the east side of the reservoir and La Cañada Flintridge on the west side. For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.

Update: 5/24/19

Week 1 Update

Public Works began sediment removal at Devil’s Gate Reservoir on Tuesday May 21, 2019 with the goal of establishing a community-first construction plan that limits truck impacts, monitors air quality and engages community stakeholders.

To date, up to 63 trucks have made over 1,000 trips, removing more than 12,500 cubic yards of sediment.

South Coast Air Quality Management District inspectors have been on-site and results from the six air quality monitors have been good. The air quality reports are available for public review at Devilsgateproject.com.

Representatives from the cities of La Cañada, Pasadena and the community of Altadena have been monitoring the project site and are providing feedback on issues concerning fugitive dust. Public Works is monitoring and addressing fugitive dust and has added additional street sweepers and water trucks.

Public Works also plans to host a series of "check in" meetings with cities, schools, and community organizations next week to recap the first week of operations and address any concerns.

For more information, please visit the project website at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.

Update: 5/20/19

Notice: Sediment removal at Devil’s Gate Reservoir to begin on Tuesday, May 21, 2019, weather permitting.

Weather forecasts predict light rainfall tomorrow that should not impact operations. LA County Public Works will continue to monitor the weather and provide updates as they become available. For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at devilsgateproject@dpw.lacounty.gov or call the Devil’s Gate Hotline at (626) 458-2507.

Update: 5/19/19

Due to an updated weather forecast predicting rain throughout Sunday evening, the start of hauling for the Devil’s Gate Reservoir Restoration Project has been postponed until at least Tuesday morning. LA County Public Works will continue to monitor the weather and provide updates as they become available.

UPDATE: 5/17/19

Notice: Sediment removal at Devil’s Gate Reservoir to begin on Monday, May 20, 2019, weather permitting.

Los Angeles County Public Works has been actively planning for a more sustainable Devil's Gate Reservoir. To achieve balance between restoring flood protection to downstream communities and preserving the natural resources of the Hahamongna Watershed, Public Works will remove 1.7 million cubic yards of sediment over 4 years from the reservoir behind Devil’s Gate Dam. In addition to providing flood relief to downstream communities that have endured nearly a decade of elevated flood risk, the restoration project will create over 70 acres of enhanced habitat for wildlife.

Public Works is currently working with the South Coast Air Quality Management District (AQMD) and the California Air Resources Board (CARB) on installing air quality monitors around the project site; all air quality monitors will be installed and operational before trucking activity begins. Additionally, trucks used to haul sediment are undergoing tests and results show trucking activity will contribute less than 0.6% of daily local NOx emissions, 0.2% of daily local PM10 emissions, and 0.4% of daily local PM2.5 emissions. Public Works also recently retested the sediment in the reservoir and found it was non-hazardous and had no traces of Glyphosate (Roundup).

For more information on the project, please visit the project website at DevilsGateProject.com, email Public Works at devilsgateproject@pw.lacounty.gov or call the Devil’s Gate Project Hotline at (626) 458-2507.

Update: 5/15/19

Los Angeles County Public Works is working to provide the community with the most current and accurate information as it becomes available. A number of new documents have been recently uploaded onto the project website ( devilsgateproject.com ), under Resources. Many of these are living documents, and will be updated as more information becomes available and the project progresses. We encourage the community to explore the project website and resources available and let us know if you have any comments or questions.

Update: 2/20/19

Storm Debris Removal at Devils Gate Reservoir

MAINTENANCE ACTIVITY

Los Angeles County Public Works is removing recent storm debris from Devils Gate Reservoir. This is routine facility maintenance and not part of the Devils Gate Reservoir Restoration Project. The debris removal is necessary to safeguard downstream communities by maintaining operability of Devils Gate Dam and maximize storage capacity in the reservoir. Once removed, this debris will be transported to Scholl Canyon Landfill in the City of Glendale.

Storm Debris Removal at Devils Gate Reservoir

DATE/TIME

County crews will begin hauling on Wednesday, February 20, 2019. Hauling operations will be limited to 7:00 a.m. to 3:30 p.m., Monday through Friday, for approximately 2 weeks. Additional debris removal work inside the reservoir may take place on weekends.

RESIDENT SUPPORT

LA County appreciates your patience and understanding during storm season. If you have questions about maintenance activities or would like to report a concern, contact Public Works Dispatch at (800) 675-HELP (4357).

Update: 11/26/18

Los Angeles County Public Works has been actively planning for a more sustainable Devil's Gate Reservoir. In an effort to achieve balance between restoring flood protection to downstream communities and preserving the natural resources of the Hahamongna Watershed, Public Works will remove 1.7 million cubic yards of sediment over 4 years from the reservoir behind Devil’s Gate Dam. In addition to providing flood relief to downstream communities that have endured nearly a decade of elevated flood risk, the restoration project will create over 70 acres of enhanced habitat for wildlife.

Habitat restoration activities have already started on the perimeter of the reservoir with the removal of non-native and invasive plant species within the Habitat Restoration Areas. In an effort to minimize the impact to the community, LA County Public Works in coordination with the Contractor, Griffith Company, are waiting to start initial construction activities until after the Thanksgiving holiday. Initial construction activities include vegetation removal from within the sediment excavation footprint and access road construction, with the sediment removal and hauling starting in April 2019. Starting the week of November 26, 2018, you will see equipment on-site and construction activities beginning, trails will be temporarily closed during weekdays, but open on the weekends. For more information you can view the Project Fact Sheet here.

Update: 10/9/18

LA County Public Works is prepared to start work on the Devil's Gate Reservoir Restoration Project within the upcoming month. The first phase of the Project involves the restoration of over 70 acres of invasive vegetation with native habitat.

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