Left Hand Creek Restoration at Brewbaker-Sorensson
Brewbaker flood damage

Left Hand Creek Restoration at Brewbaker-Sorensson

Post-flood restoration work is being planned along the Left Hand Creek on the Brewbaker-Sorensson property in unincorporated Boulder County.

Project Summary

Boulder County is planning creek restoration along Left Hand Creek on the Brewbaker-Sorensson property to repair damage from the 2013 flood and subsequent human interventions. This project will restore the creek using a natural channel design approach. Restoration of the stream channel includes the reconnection of the stream with its floodplain and alterations of channel morphology through adjustments of stream pattern, dimension, and profile. This will be achieved by lowering the width-to-depth ratio of the stream; placement of in-stream bank stabilization and habitat structures, large wood and boulders; and restoring riffles and pool features. The design also includes modifications to the bed and bank. Stream banks will be stabilized using bio-engineering techniques like willow staking and large wood placement.

Boulder County has teamed with North State Environmental and its subcontractors, Five Smooth Stones Restoration Services and AloTerra Restoration Services, (the Design Team) to design and implement the creek restoration through a design-build contract. The Design Team generated 60% construction drawings for implementation. During construction, additional field fits may be necessary as determined by field conditions.

Project Location

The project area lies within the Brewbaker-Sorensson property, which is located at 41st Street and Oxford Road, in unincorporated Boulder County, Colorado. The project is in and adjacent to Lefthand Creek from 1,250’ downstream of N. 41st St. and extends approximately 2,000’ downstream.


The anticipated construction start date is August 16, 2018, with construction duration of 8-12 weeks. Following construction and revegetation, the contractor will maintain plantings for two years with watering, plant replacement and reseeding as needed. Parks & Open Space staff will monitor the project post-construction for restoration success.

Project Goals

  • Reduce future flood risk to neighboring private and public properties
  • Protect and improve the quality and extent of aquatic, riparian and wetland habitat
  • Restore stream channel and floodplain geomorphic processes and function
  • Restore riparian ecological processes and function
  • Provide for agricultural use


This project is funded by Boulder County Certificate of Participation (COPS).

Project Documents

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Parks & Open Space

David Hirt