Cold Water Refuge

Doak Brook 2015

Doak Brook 2015

Enhancing the Cold Water Refuge at Doak Brook

The project site is located along a section of the SW Miramichi River in the Village of Doaktown, NB, immediately upstream of the bridge crossing on Route 8. Doak Brook enters the SW Miramichi River on the right bank (south bank) and flows into relatively deep water. Widening of the mouth of the brook had resulted in reduced energy flow at the mouth which inhibited the brook’s cold water from entering far enough out into the river where salmon prefer to hold in deeper water during the summer’s flow of low warm water.

To increase the brook’s energy, the mouth of the brook was narrowed by installing a rock toe along the right bank as it merges with the riverbank. In addition, a nature-like point bar feature was installed on the downriver side of the confluence (right bank of the brook) which will direct cold water into the deep area of the river where salmon typically hold during periods of low warm water. An embedded rock toe was also installed to help the brook transition into the river.

This habitat enhancement work was initiated and completed on Sept. 14, 2015. A further enhancement followed on September 26, 2015 with the installation of a large cement pad boat ramp. This ramp will prevent tire-spinning and erosion when launching or retrieving boats in the boat launch area, which is located within the cold water plume of Doak Brook.

boat ramp pads

Boat ramp pads

DSCN0607

Boat ramp installed Sept 2015

 

 

 

 

 

 

Funding support for this project was received from the Recreational Fisheries Conservation Partnership Program (RFCPP), the New Brunswick Wildlife Trust Fund (NBWTF) and the Atlantic Salmon Conservation Foundation (ASCF). The MSA’s financial contribution was provided through MSA Campaign 60 revenues.


Enhancing the Cold Water Refuge at Otter Brook

The project site is located at the confluence of Otter Brook and the LSW Miramichi River, approximately 6.5km downstream of Catamaran Brook. The brook enters the river on the right (south) bank. The LSW Miramichi is very shallow in this area during typical summer low flows, and the cold water plume created by the brook is known to provide thermal refuge for mostly young juvenile salmon. Enhancing the brook’s plume will transform the area into a more favourable physical thermal refuge for adult Atlantic salmon as well.

Otter Brook September 2015

Otter Brook September 2015

To enhance the refuge’s thermal features, the water depth was increased at the mouth of Otter Brook through the installation of a rock v-weir upstream in the LSW Miramichi River to concentrate flow and encourage scouring at the mouth of Otter Brook. The v-weir was set at an elevation so as to create scour and direct flow from the shallow river into a concentrated area where cold water meets the river. Rock spurs were also installed in conjunction with the v-weir downriver of the confluence to keep the cold water plume turned away from the shallow riverbank and also to help scour and maintain deeper water in the refuge zone. Finally, a row of embedded boulders were placed near the outer edge of the cold water plume so that in summer low flows, cold water from the brook is able to concentrate in the scoured region without significant mixing with warm river water.

This habitat enhancement work was initiated on Sept. 15, 2015 and completed on Sept. 16, 2015. Funding support for this project was received from the Recreational Fisheries Conservation Partnership Program (RFCPP) and the Atlantic Salmon Conservation Foundation (ASCF). The MSA’s financial contribution was provided through MSA Campaign 60 revenues.

Enhancing the Cold Water Refuge at Indiantown Brook

This project site is located at the confluence of Indiantown Brook and the SW Miramichi River in Quarryville, an area located in the lower stretch of the river system. The brook enters the river on the left (north) bank and enters the Miramichi River in a relatively deep area, creating a cold water refuge known to be used by adult Atlantic salmon during warm water periods in the summer. This site is easily accessible, rendering it easily susceptible to predation and poaching while salmon are confined to the cold water pool at the mouth of the brook.

rock clusters

Rock clusters at Indiantown Brook

To enhance the refuge’s habitat features, boulder clusters were installed directly into the existing pool. Placement of these boulder clusters will cause flow separation around the rocks, resulting in the formation of eddies in their wake. Eddies diffuse the sunlight, providing overhead cover for fish. In addition, flow vertices generate scour that form pockets of deeper water and promote settling of coarser substrate which improves physical substrate diversity. Such features provide ideal conditions for juvenile and adult salmonids. Diversifying substrate with boulder clusters will also discourage poaching efforts, as fish will no longer be easily spotted and nets will no longer easily swept through the pool.

This habitat enhancement work was initiated on Sept. 16, 2015 and completed on Sept. 17, 2015.

Funding support for this project was received from the Recreational Fisheries Conservation Partnership Program (RFCPP) and the Atlantic Salmon Conservation Foundation (ASCF). The MSA’s financial contribution was provided through MSA Campaign 60 revenues.

 Enhancing the Cold Water Refuge at Pat’s Brook

Pats Brook flows into the NW Miramichi River approximately 6.8km north of the Trout Brook confluence. The brook enters the river on the left (north) bank. The river is shallow in this area during typical summer low flows and the plume created by the cold brook water provides thermal refuge to primarily juvenile salmon.

To enhance this habitat as an adult salmon refuge, a rock V-weir was installed upriver of the confluence of the brook and river, set at an elevation that will create scour at the mouth of the brook. This will direct flow from the shallow river into a concentrated area where cold water meets the river. Channel material was removed downstream of the v-weir to encourage flow direction and create greater depth immediately in the refuge. Rock spurs installed in conjunction with the v-weir downriver of the confluence will help keep the cold water plume turned away from the shallow riverbank and directed toward the deeper pool.

Pat's Brook - Before #1

Pat’s Brook – Before #1

Pat's Brook - Before #2

Pat’s Brook – Before #2

 

 

 

 

 

 

Pat's Brook - Enhancement Work in Progress

Pat’s Brook – Enhancement Work in Progress

Pat's Brook - After #1

Pat’s Brook – After #1

Pat's Brook - After #2

Pat’s Brook – After #2

 

 

 

 

 

 

This habitat enhancement work was initiated and completed on Sept. 28, 2015. Funding support for this project was received from the Recreational Fisheries Conservation Partnership Program (RFCPP), the New Brunswick Environmental Trust Fund (NBETF) and Glencore Canada. The MSA’s financial contribution was provided through MSA Campaign 60 revenues.