Environmental Stewardship - Cariboo Region
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Canimred Creek Tributaries Bridge Construction

Objectives

The primary objective of this project was to replace a small culvert with a bridge to allow fish passage.

FRBC Region/ MELP Region/ MoF Region

Cariboo-Chilcotin/Cariboo/Cariboo

Author

Ken MacKenzie

Proponent

Weldwood of Canada Ltd.

100 Mile House Operations

Location:

The crossing is located 2.0 km down a side road at 17 km on the Bowers FSR at an unnamed stream that flows into Canimred Creek.

Introduction

Canimred Creek has high densities of rainbow trout and may be an important spawning stream for Canim Lake. The streams affected by this project have high spawning and rearing habitat potential.

Assessments and Prescriptions

This barrier to fish was identified during a field inspection by Weldwood . The culvert was undersized for Q100 flows, was quite long (25 meters), at a gradient that prohibited fish passage and had a small outfall drop (fig. 3-1). A clear span structure was determined to be the best option for restoring fish passage.

Rehabilitation Work

To minimize environmental impacts during the weir construction, the following steps were taken:

  • A bypass channel was constructed adjacent to the culvert that was armored with clean rock prior to stream diversion (fig. 3-2).
  • Riprap was placed at the upstream bend in the creek to eliminate erosion and potential sediment inputs to the stream.
  • Sediment traps of hay bales and filter cloth were placed downstream to maintain water quality during channel reconstruction work.
  • An environmental monitor was on site for all phases of construction

Structure Details

  • 15 meter concrete slab deck (fig. 3-3).
  • 30° skewed approaches
  • 8 inch steel posts on pre-cast concrete footings
  • reconstructed channel width 4 to 5 meters

Cost Summary

Site Plan Preparation $2,000

Bridge design, supply and install $54,800

Rip rap supply, supervision $6,500

TOTAL $62,800

Environmental Benefits

2.4 km of habitat is now available to fish.

For Further Information Contact:

Ken MacKenzie
P.O. Box 97
Weldwood of Canada Ltd.
100 Mile House Operations
1 00 Mile House, BC
V0K 2E0
Tel. (250)395-8200

Figure 3-1. Outfall of culvert

Figure 3-1. Outfall of culvert

 

Figure 3-2. Construction of bypass channel.

Figure 3-2. Construction of bypass channel.

 

Figure 3-3. Completed installation

Figure 3-3. Completed installation

 
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