Ministry of Water, Land and Air Protection - Beverly Lake Elliptical Culvert Ste 641 Road

Beverly Lake Elliptical Culvert Site 641 Road

Objectives

To replace a culvert barrier with a crossing structure that could accommodate spring flows and allow fish passage at all times of the year.

FRBC Region/ MELP Region/ MoF Region

Cariboo-Chilcotin/Cariboo/Cariboo

Author

Ken MacKenzie

Proponent

Weldwood of Canada Ltd.
100 Mile House Operations

Location

The site is located at 1 km on the 641 Road in the Eagle Creek Drainage. The stream is the main inflow to Beverly Lake.

Introduction

The site is located upstream from Susan Lake which has a Forest Service recreation site and receives moderate fishing pressure. The stream has good spawning and rearing fish habitat potential.

Assessments and Prescriptions

This site was not ranked in the Eagle-Bradley fish passage-culvert inspection report because work to replace it had already been initiated. However, based upon the quantity and quality of habitat gained and the barrier that existed prior to replacement this site would have ranked 3^rdor 4^th.

The existing culvert was undersized to accommodate high spring flows (fig 6-1) and acted as a barrier to fish by increasing water velocity and having a 25 cm outfall drop. As the stream width was relatively small (around 1.7 meters) an elliptical culvert was determined to be a viable option to restore fish passage.

Rehabilitation Work

Low flows at the time of replacement allowed the stream to be pumped around the work area during installation (fig. 6-2).
Silt fences were installed downstream for all phases of construction.
An environmental monitor was on site during all phases of construction.

Structure Details

2540 mm wide by 1630 mm high by 15850 mm long elliptical culvert.
Culvert was embedded 20% (320 mm) of height into the reconstructed streambed.

Cost Summary

Site Plan and Culvert $19,000
Installation, riprap and road resurfacing $19,427
Total $38,427

Environmental Benefits

An additional 5.1 km of habitat are now available to fish.

For Further Information Contact:

Ken MacKenzie
P.O. Box 97
Weldwood of Canada Ltd.
100 Mile House Operations
100 Mile House, BC
V0K 2E0
Tel. (250)395-8280

Figure 6-1. Culvert prior to replacement:

Figure 6-1. Culvert prior to replacement:

Figure 6-3. Final installation:

Figure 6-3. Final installation

Figure 6-2. Stream diversion during in-stream works:

Figure 6-2. Stream diversion during in-stream works