Isabella Lake Dam Safety Modification Project Situation Report – December 2018

Isabella Lake Dam Safety Modification Project Situation Report – December 2018

Sacramento, CA – Isabella Lake Dam (consisting of a Main Dam, Auxiliary Dam and service spillway) is located about 40 miles northeast of Bakersfield in Kern County, California, and became fully operational in 1953.

The Main Dam is located near the confluence of the north and south forks of the Kern River and the Auxiliary Dam is located about half a mile east of the Main Dam.

The Main Dam is a 185-foot-high earth-fill dam, and the Auxiliary Dam is a 100-foot-high earth-fill dam. The service spillway is located between the two dams.

The reservoir (Isabella Lake) has a gross storage capacity of 568,075 acre feet.

Highlights (Last 30 days)

  • The Phase II Dams and Spillways contractor (Flatiron/Dragados/Sukut Joint Venture or FDS) continues construction activities.
  • The construction area including Engineers Point is an active construction area and is off limits to the public.
  • FDS is coordinating with local labor unions for labor support to the project. The FDS local office is open and they have information about employment opportunities.
  • FDS continues work to seal the Borel conduit. The work is expected to be complete in March.

Looking Ahead (Next 30+ days)

  • Reservoir pool levels were lowered to approximately 72,000 ac-ft (2543.0 feet) on October 01, 2018. USACE will attempt to maintain a maximum reservoir at of 72,000 ac-ft until the Borel low water work is complete.
  • Construction on SR-155 is underway and will continue into 2019, creating traffic delays near the Main Dam. USACE will provide updates on expected impacts via public outreach, the monthly SITREP, and the Isabella Task Force.
  • The contractor will continue to conduct blasts on the emergency spillway excavation. SR 155 will be temporarily closed during blasting operations.
  • USACE is preparing a plan to extend the French Gulch boat launch during the low water level period.

The December Isabella Lake Dam Safety Modification Project Situation Report is available on our website:

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