Managing Shoreline Erosion on Canadian Lakes

Updated May 24, 2026 · about 8 minutes

Every shoreline moves. Wind, waves, ice, and changing water levels carry material along a bank, and some of that change is the lake simply doing what lakes do. The task is to tell ordinary movement from accelerating loss, and to slow the second kind without making the shore worse.

Eroded lake bank with exposed soil and undercut edge — An undercut, eroding bank. Photo: N Chadwick, Wikimedia Commons (CC BY-SA 2.0).

What moves a bank

Several forces act together along a Canadian lake shore:

Wave action from wind, and on busier lakes from boat wake, chips away at the toe of a bank.
Ice expands, shifts, and pushes against the shore through winter and at break-up.
Water-level change exposes and re-wets the bank, weakening it through repeated cycles.
Surface runoff from the upland cuts channels and carries material down the slope.

Natural change or a problem?

A gently retreating bank that still carries vegetation may be in slow, natural equilibrium. Signs that erosion has tipped into a problem include a steepening, bare face; exposed and undercut roots; soil slumping into the water after storms; and clouded water near shore after rain. Photographs from the same vantage point across seasons make the trend obvious in a way that memory does not.

A useful distinction

Hardening a shore with a vertical wall often deflects wave energy sideways and downward, which can worsen erosion on a neighbour's lot or scour the lakebed at the wall's base. Softer approaches absorb energy instead of bouncing it.

Living shorelines first

A living, or soft, shoreline uses plants, roots, and natural materials to dissipate energy and rebuild stability. Compared with a concrete or steel wall, it flexes with the lake, supports habitat, and tends to need less drastic intervention over time.

Re-vegetateDeep-rooted native plants bind the bank and slow runoff from above.
Protect the toeCarefully placed natural stone or anchored wood can guard the base where waves strike.
Reduce wakeEncouraging slower boating near shore lowers the wave energy reaching the bank.

When harder structures enter

On high-energy shores or where infrastructure is at risk, engineered protection is sometimes necessary. Even then, hybrid designs that combine a protected toe with a planted upper bank usually outperform a bare wall on habitat and on long-term resilience. These are decisions for a qualified professional, not a weekend project.

order of preference, generally
keep and restore native vegetation
soften the toe with natural materials
hybrid (protected toe + planted bank)
engineered hard armour (last, with advice)

Shoreline work in Canada is regulated. Before placing material, grading, or building, contact your local conservation authority or provincial ministry and Fisheries and Oceans Canada to confirm approvals and timing windows that protect fish.

Where to learn more

Fisheries and Oceans Canada outlines how to plan projects near water to avoid harm to fish habitat, and provincial authorities set the permits and seasonal restrictions that apply locally.