Feature Articles

Studying Sedimentation to Protect Native Trout

By Ann Sullivan

Conservation biologists tend to be a grumpy bunch, according to Dave Mayhood. But with help from stewardship organizations like the Elbow River Watershed Partnership, maybe Mayhood and his colleagues will start feeling positive about changes in Alberta’s water bodies and riparian zones.

Mayhood, an aquatic ecologist and president of FWR Freshwater Research Limited, has been working to bring attention to the state of Alberta’s native Westslope Cutthroat Trout as their population declines and sedimentation of their habitat increases. He is currently researching sediment loading to several streams in the McLean Creek Public Land Use Zone (PLUZ), one of the few remaining areas with genetically pure stocks of Westslope Cutthroat Trout.

One hundred years ago, Westslope Cutthroat Trout were an abundant species in the Upper Bow and Oldman River systems and mostly likely the Milk River too. These days there’s almost nothing left of those pure stocks. It’s a classical conservation issue, says Mayhood: a very small population in a fragmented and highly unproductive habitat. Some of the creeks in which cutthroat are still found are tiny—just several kilometres long and narrow enough to easily jump across. Others, like Silvester Creek in the Elbow River watershed, are loaded with sediment from off-highway vehicle (OHV) traffic, pipeline rights of way and trail and road surface erosion.

Native cutthroat stocks started declining decades ago, through a combination of overfishing and hybridization with introduced trout species. About five year ago, the federal government listed the Westslope Cutthroat Trout as “threatened” under the Species at Risk Act (SARA). Mayhood would argue that the species is endangered, not just threatened, and notes that the government has created a recovery strategy for the species but still needs an action plan to save it.

So, what’s the big deal if we lose a few genetically pure fish stocks in Alberta? Mayhood says that we need every single one of these genetically unique and locally adapted stocks. “When we’re knocking off species at the rate we’re knocking them off now,” he says, “we’re limiting the possibility of future life on the planet.” All life comes from existing life, he adds. “It’s not just a question of ‘it would be nice.’ We need them.”

Silvester Creek, which lies within the Elbow River watershed, provides critical cutthroat habitat. Part of the creek is protected under SARA, but the area is popular with OHV riders, who use a network of official and unofficial trails for recreation. Silvester Creek runs through the McLean Creek PLUZ, designated as an off-highway use area in the 1970s. The trail network that crisscrosses the area adds to sedimentation in local creeks and ultimately in the Elbow River.

Roads and trails are by far the biggest contributors of total suspended solids in streams, Mayhood says. For struggling native trout, it takes very little road development to reduce populations. Cutthroat require pools for spawning, but those pools are often marred by sediment, especially during times of increased runoff from snowmelt and rainfall. Illegal stream crossings by OHVs at any time of year lead to perpetually disturbed trails and increased sedimentation.

Mayhood’s current research project was to look at sediment loading to streams in the McLean Creek area, but because 2017 was such a dry year, the team focused its efforts on identifying sediment sources. They found that McLean Creek, which represents less than four percent of the Elbow River basin, supplied a disproportionate amount of sediment being carried in the river. This year’s very dry conditions will mean study results won’t necessarily represent what’s really going on in the area. “In other years that creek has run like chocolate milk,” he said.

McLean Creek area may require major changes to safeguard fish stocks and habitat, but Mayhood says that restoration work by volunteer stewardship groups, including the ERWP, is a step in the right direction. “I do expect some improvements,” he said, adding, “I have high hopes for the October [2017] work in particular.”

In October of this year, volunteers with the ERWP decommissioned an illegal trail near a bridge at the lower end of Silvester Creek. The group closed access to the trail on both sides of the bridge by digging it up and replacing it with “rough and loose” technique. Volunteers also planted willow stakes to help restore the area and deter OHV traffic.

Along with restoration work, Mayhood would like to see more trail signage in the area to discourage illegal trail use by OHVs. Logging companies now close roads after they finish work in the area, he said, which is also helpful.

Mayhood says fish stocks can recover with a strategy that includes retaining existing stocks, removing non-native fish and protecting watersheds.

Fortunately, the ERWP does just that, working to protect watersheds and enhance fish habitat via riparian restoration and other projects. The Southern Alberta Fish Habitat Enhancement and Sustainability Program and the Westslope Cutthroat Trout Recovery Team are currently working on restoring sites in the Elbow Watershed, including Silvester Creek. For more information, visit the government website here.

“We’ve had this problem for a long time and it’s going to take us a long time to get out,” Mayhood said. “The thing is to get started.” That’s just what stewardship groups like the ERWP have done.

The report on sediment loading to streams in the McLean Creek Area by Dave Mayhood and his team will be available in the new year.

Click the link below to download the PDF of this article. 

  pdf Studying Sedimentation - Dec 2017 article (2.68 MB)

 

 

Dec 2017 article 01

A heavily-used but undesignated (illegal) trail drains silt steeply downhill to a known cutthroat trout spawning site, Silvester Creek. In partnership with the Westslope Cutthroat Trout Recovery Team, this trail was decommissioned by the ERWP in October 2017. Dave Mayhood photo

 

 

Dec 2017 article 02

In partnership with the Westslope Cutthroat Trout Recovery Team, this trail was decommissioned by the ERWP in October 2017. The site was restored using a variety of techniques including “rough and loose,” spreading woody debris, scarifying and willow planting. The project was partially funded by a Watershed Resiliency and Restoration Program grant. Kelly Dick photo

 

Dec 2017 article 03

In 2018, the ERWP plans to work collaboratively with Shell Canada and the Alberta Westslope Cutthroat Trout Recovery Team to restore this site near Silvester Creek. Dave Mayhood photo

 

Dec 2017 article 04

Mayhood’s team measures gully erosion more than 1 metre deep on a closed but still heavily-used OHV trail. The fine sediments from this site have been washed downhill into Silvester Creek, critical habitat for threatened native cutthroat trout. Dave Mayhood photo

 

Dec 2017 article 05

Once a road surface becomes saturated, even very light rainfall generates muddy runoff to streams. Here several days of intermittent light rain allowed a very light shower to deliver silt-laden runoff to a major tributary of Silvester Creek. Dave Mayhood photo

 

Dec 2017 article 06

Filters from water samples show the results of road runoff to Silvester Creek. The upper four rows are from triplicate water samples filtered from four locations along the creek. The bottom row shows filters from triplicate water samples taken from a control site unaffected by road runoff. Dave Mayhood photo

 

 

Research Helps Identify Sources of Old Water in the Elbow River

by Ann Sullivan

Rae Glacier melts and the Elbow River runs faster. Stop the flow and the river must stop too, correct? Well, no. Although glacial extent has become smaller due to changes in climate, stream flows in the Elbow have remained similar. To Éowyn Campbell, this means that water in the river is coming not only from glacial melt but from other places as well. Finding those places is the subject of Campbell’s PhD research at the University of Calgary.

Working with supervisor Dr. Cathy Ryan and funded by an NSERC Discovery Grant, Campbell is studying the “role of the river-connected alluvial aquifer (RCAA) of eastern-slopes rivers in storing and releasing water to the open stream.” She hopes her research will allow for a better understanding of river water and water sustainability. For example, how many drought years can the Elbow River sustain? What is the approximate volume of stored water in the RCAA? And is water storage capacity large enough that it will adjust to varying river flow rates? Given that the Elbow supplies water to about one-sixth of Albertans, this is critical information.

So far, Campbell has identified three places where water is likely being stored and released into the main streamflow of the Elbow: alluvial rocks, deep cracks in the mountains and hill-slope soils. “Once I know what proportion is coming from different sources,” she said, “I can estimate the volume of water stored in those sources and how long those sources would last.”

Read more: Research Helps Identify Sources of Old Water in the Elbow River

Barbara Teghtmeyer and the Bragg Creek Trading Post Hold their Ground along the Elbow River

by Ann Sullivan

Elbow River 1963Flood

The Elbow River rages during the 1963 flood.

Over a lifetime of living on the banks of the Elbow, Barbara Teghtmeyer has seen the river in every state, from slow and meandering to full-blown raging. She can reel off a list of flood years: 1932 (“the mother of all floods”), 1948, 1963, ‘67, ‘68 and 1995. In her lifetime, though, the biggest and most destructive flood hit just four years ago, on June 20, 2013.

On the day the Elbow River came crashing through Bragg Creek, Teghtmeyer was up early to open the family-owned Shell gas station in the hamlet. At 5:30 that morning, the river was unusually high and unlike anything she’d seen. “I have never seen the river black, and there were vertical waves,” she said. “I thought, ‘This is bad. This is really bad.’”

Read more: Barbara Teghtmeyer and the Bragg Creek Trading Post Hold their Ground along the Elbow River

Elbow River Watershed Partnership Announces Its Canada 150 Photo Contest

Purpose

The ERWP is celebrating Canada 150 by holding a photo contest in 2017. Our goal is to showcase the best photographs of the Elbow River watershed, including the river itself, wildlife, recreation, natural history, environment, culture and people. Each image should convey something evocative about the watershed and what the watershed means to you.

Entry Deadline: Tuesday, October 31, 2017

We require your submitted digital image and completed entry form by October 31, 2017.

Read more: Elbow River Watershed Partnership Announces Its Canada 150 Photo Contest

Southwest Calgary Ring Road Construction Includes Realignment of One-Percent Length of Elbow River

After decades of negotiation, the Southwest Calgary Ring Road (SWCRR) is now under construction. Discussion about a ring road around the city began in the 1970s, when the population of Calgary was about 325,000. By 2013 the city’s population had multiplied four times to more than 1.3 million people. And while talks continued about the southwest portion of the road, a 70-kilometre stretch of ring road was completed northwest, northeast and southeast of the city.

In November 2013, the Government of Alberta and the Tsuut’ina Nation signed a land transfer agreement that would allow the SWCRR to be built. This piece of the city’s 100-kilomtre-plus ring road will run from Highway 8 (near Elbow Springs Golf Course) to McLeod Trail SE. The 31-kilometre stretch of six- and eight-lane divided highway will include 47 bridges – including crossings over the Elbow River and Fish Creek – and 14 interchanges. (For more information on the SWCRR, visit http://www.swcrrproject.com/.

Construction partnership Kiewit Graham Ledcor (KGL Constructors) is charged with designing and building the southwest ring road. As part of the project, KGL will work with Golder Associates to realign a 1.4-kilometre stretch of the Elbow River in the Transportation Utility Corridor west of 37 Street SW.

Read more: Southwest Calgary Ring Road Construction Includes Realignment of One-Percent Length of Elbow River

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