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Posted: May 22, 2019, 2:54 pm

Saddle Lake Dam Spillway Upgrade at Grand Forks, BC.

Regional District of Kootenay Boundary



Regional District of Kootenay Boundary

Request for Tender 

Saddle Lake Dam Spillway Upgrade at Grand Forks, BC.


Project Summary

The dam safety upgrades are primarily a result of recommendations from the 2014 Dam Safety Review for Saddle Lake Dam completed by EBA Engineering Consultants Ltd. (EBA, 2014). These upgrades will be part of the first phase of a project to rehabilitate and stabilize the dam over a period of three to five years. The phases have been divided as follows, based on budgetary constraints and timing:

Phase 1 – Spillway Upgrades: Includes the addition of the free overflow spillway located on the left abutment discharging directly downstream of the existing dam. These works are proposed to occur with a gradual dewatering period beginning immediately following freshet 2019 and reaching appropriate levels in August 2019 to allow for construction.

Construction of works are planned to occur between September and October of 2019.

Phase 2 – Stability Upgrades: This involves upgrades on the structure, including the installation of lock blocks on the top of the dam to tie the existing concrete face to the earthen section of the dam. It also includes the addition of filter fabric and additional fill on the downstream side to adjust the downstream toe angle to 1.5 to 1, and finally, the installation of riprap to protect the downstream surface.

Phase 3 – Low-Level Outlet Upgrades: Phase 3 of the Saddle Lake Dam upgrade will include addressing the low-level outlet. This phase will include the installation of a new outlet valve on the downstream side, cleaning of the low-level outlet pipe, and an inspection. At this time, we are unclear on the exact extent of the low-level outlet repairs required. These will be investigated further as part of the ongoing maintenance of the structure.

The RKDB is currently seeking service from a qualified contractor for the first phase only of the Saddle Lake Dam upgrade, including the free overflow spillway on the left abutment and associated discharge works into the spillway below as detailed in the attached drawing package.
The work generally includes:
  • Submission of Construction Supervision Plan & Environmental Management Plan.
  • Acquisition of a Fish Salvage Permit, if required by EMP drawdown and aquatic wildlife salvage.
  • Site Preparation, including excavation and backfill with granular fill.
  • Removal of dirt, debris and deleterious substances from the area.
  • HDPE liner installation.
  • Supply and placement of gabion baskets.
  • Concrete work.
  • The contractor is responsible for flagging and protection of the public during construction.
Saddle Lake Dam is situated approximately 4.6 km west of the Township of Grand Forks, BC at Map Grid (NAD83) co-ordinates E 390325, N5431645 (Zone 11). The dam is catalogued in the BC MFLNRO Dam Safety Branch dam database under Dam File No. D210135-00.

The dam is oriented west to east, has a crest length of approximately 42 m, and is about

1.m high at its maximum height, with a crest elevation of approximately 683.0 m above mean sea level (AMSL).

Key Dates
Date of Issue: May 22, 2019
Mandatory Pre-Tender Site Meeting: June 5, 2019
Clarification deadline: June 14, 2019
RFT Closing Date: June 21, 2019
Anticipated Award Date: July 5, 2019
Work Start Date: September 2, 2019
Substantial Completion Date: November 15, 2019

Every attempt will be made to meet all the dates listed above; however, the Owner reserves the right to modify any or all dates at its sole discretion.

The RDKB has secured funding for upgrades up to a value of $ 190,000, bidders may propose to provide additional phases of the project should their fees not exceed this amount. If no bids can accommodate the project within the secured funding, the RDKB reserves the right to reconsider and/or rescope the project subject to the received bids.

RFT documents are available for download at: Paper copies are available by contacting Austin Engineering Ltd. at: Jenn.Wilson@austinengineering.ca

Request for Tender

Location: Trail
Region: West Kootenay / Boundary
Business Categories: Construction,Environmental Management & Consulting,Water Provision & Maintenance
Expires: June 21, 2019, 12:00 pm