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Left Hand Creek Restoration at Brewbaker-Sorensson
Brewbaker flood damage

Left Hand Creek Restoration at Brewbaker-Sorensson

Post-flood restoration work was completed along the Left Hand Creek on the Brewbaker-Sorensson property in unincorporated Boulder County.

Project Summary

Creek restoration work was completed along Left Hand Creek on the Brewbaker-Sorensson property to repair damage from the 2013 flood and subsequent human interventions. This project restored the creek using a natural channel design approach. Restoration of the stream channel reconnected the stream with its floodplain and altered the channel morphology through adjustments of stream pattern, dimension, and profile. This was 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 included modifications to the bed and bank. Stream banks were stabilized using bio-engineering techniques like willow staking and large wood placement.

Boulder County teamed with North State Environmental and its subcontractors, Five Smooth Stones Restoration Services and AloTerra Restoration Services, to design and implement the creek restoration through a design-build contract.

Before & After

Brewbaker Before: Aug 1, 2019

August 1, 2019

Brewbaker After: Sept 24, 2019

September 24, 2019

Brewbaker Before: Aug 1, 2019

August 1, 2019

Brewbaker After: Sept 24, 2019

September 24, 2019

Construction Photos

Brewbaker-Sorensson Restoration #1

Brewbaker-Sorensson Restoration #2

Brewbaker-Sorensson Restoration #3

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.


Construction began on Aug. 1, 2019, and earthwork completed Sept. 25. Crews are planting 2,400 wetland plugs, 1,800 trees and shrubs, and 1,000 willow stakes and 100 dormant cottonwood poles. Final revegetation work will include regrading and reseeding the staging area. 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 was funded by Boulder County Certificate of Participation (COPS).

Project Documents

Contact Us

Parks & Open Space

David Hirt