Stormwater Detention Pond 6 Dredging

Mechanical dredging and vegetation removal from shallow draft detention pond.

Project Summary

CONTRACT VALUE: $1,000,000


This project consisted of the mechanical dredging of ~28,000 cubic yards of non-impacted sediment and removal of ~8 acres of dense vegetation to increase the capacity of the detention pond and create a flow channel from the pond inlet to the outflow. The mechanical dredging methods White Lake utilized ultimately shortened the timeframe for the job, significantly reduced disturbances to the existing site, and eliminated potential issues with hydraulic dredging and dense vegetation binding with the initially proposed GeoTube dewatering methods the client had initially specified. All dredging was conducted with White Lake’s Sennebogen 835 with environmental clamshell bucket equipped with real-time RTK GPS positioning system to provide the most accurate grade possible.


As a benefit of the mechanical dredging methods employed by White Lake, any debris that was encountered was handled alongside other dredge spoils which was an added benefit over the hydraulic dredging methods that the client initially specified.


The mechanical dredging methods employed by White Lake produced very little free water so no dewatering or water treatment was required. This saved the client a considerable amount of time and money when compared to the hydraulic dredging and GeoTube dewatering methods they had originally specified.

This project involved close coordination with the client to monitor and manage water levels within the detention pond to facilitate dredging yet assure the pond had surplus capacity in the event of a rain event. The mechanical dredging methods employed by White Lake involved only very shallow draft equipment. This assured work never had to stop in the event of an impending rain event and provided the client peace of mind.


All dredge spoils were disposed of on the WCAA’s property in a security restricted area. This required close coordination with WCAA security and all drivers had to receive security clearance prior to project kick off.

White Lake also assisted the client in the process of identifying where the spoils should be disposed of so as not to interfere with other contractors working in the area. To facilitate access to parts of the disposal site which were out of the way of other contractors and not easily accessible to on-road trucks without significant investment in haul road construction, White Lake proposed the use of off-road trucks to haul sediment between the dredging site and the access restricted disposal site. White Lake acquired all the necessary permits, designed, and built a temporary construction entrance to allow off-road trucks to cross a public roadway between the dredge site and the disposal site.


White Lake finished this on time, on budget, with an excellent health and safety record. There were no health and safety incidents during this job.

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