Buying on Bobs Lake: What to Know Before You Offer

Where is Bobs Lake and how far is it from Kingston?

Bobs Lake is 45 to 60 km north of downtown Kingston in a straight line, or roughly 70 to 80 minutes by car depending on which shore you are driving to. Most of the lake lies in South Frontenac, with a small tip of Mill Bay in Central Frontenac and the northeastern end in Tay Valley, in Lanark County. It is also commonly written as Bob's Lake.

Bobs Lake at a glance

Size	About 16 km long and 5 km wide, with a surface area of 32.22 sq km (7,962 acres)
Municipalities	South Frontenac (most of the lake), Central Frontenac (the tip of Mill Bay), and Tay Valley (the northeastern end)
Outflow	The Tay River, through the dam at Bolingbroke, flowing northeast to the Rideau River
Water levels	Managed by Parks Canada as a Rideau Canal reservoir
Shoreline permits	Rideau Valley Conservation Authority
Drive from Kingston	About 70 to 80 minutes, from the nearest shore to Bolingbroke

Size and municipalities: Bobs Lake, citing the Geographical Names Board of Canada. Dam and water levels: Parks Canada. Drive times are OpenStreetMap routing estimates from Kingston City Hall and vary with season and road.

The lake sits on the Frontenac Axis, a finger of the Canadian Shield that runs south from Algonquin Park. That rocky, many-armed shape is why Bobs Lake is really a series of basins and bays rather than one open sheet of water.

Which conservation authority controls what you can build on the shoreline?

The Rideau Valley Conservation Authority (RVCA). Bobs Lake drains into the Tay River and on to the Rideau, so it sits in the Rideau Valley watershed, and RVCA is the conservation authority that issues permits for work near its shoreline. Contact RVCA before you plan a new dock, shoreline work, or grading on the lot.

RVCA administers Ontario Regulation 41/24 under the Conservation Authorities Act. A permit from RVCA is needed for work near lakes, wetlands, floodplains, and steep slopes, including placing a building or structure, grading, and placing or removing fill.

RVCA's Bobs Lake catchment report calls for a minimum 30 metre development setback from the water. The exact setback, and what may sit inside it, comes from the township zoning by-law. Confirm it with South Frontenac, Central Frontenac, or Tay Valley for the specific lot.

Who manages the water level on Bobs Lake?

Parks Canada. Bobs Lake is one of two reservoir lakes for the Rideau Canal, and Parks Canada manages water levels on the canal and throughout its watershed. Water leaves the lake through a dam at Bolingbroke, so the level you see at a showing is a managed level, not a natural one.

There has been a dam at Bolingbroke since at least 1821. The Government of Canada bought the site in 1870 to enlarge the reservoir for the northern section of the canal, and Parks Canada began building a replacement dam in 2018. Parks Canada stated that the new dam would not change the water management strategy for the lake.

Parks Canada lowers reservoir levels to make room for the precipitation that comes in fall, winter, and spring. It identifies Bobs Lake as a cold water fishery, so the level has to be down by mid-October to protect fish spawning. Source: Parks Canada water management questions.

• Dock depth. Ask how deep the water is at the dock after the fall drawdown, not only in summer listing photos.
• Shoreline exposure. A gently sloping shore shows more exposed ground when the level drops than a steep, rocky one.
• Boats and lifts. Ask the sellers when they take the boat out each fall and whether the lift or launch still works at the lower level.

Why does it matter which part of Bobs Lake a property is on?

Bobs Lake is a chain of distinct basins and bays rather than one open expanse, so two properties on the same lake can offer very different experiences. Open basins give big views and boating room, while sheltered bays suit paddling, fishing, and calmer swimming.

The Greater Bobs and Crow Lakes Association describes the lake as a series of basins and bays, including the Eastern and Western Bobs basins, Crow Bay, Buck Bay, Green Bay, Mud Bay, Mill Bay, and Long Bay. It also notes that most of the Bobs Lake shoreline is privately owned, with pockets of Crown land.

• Exposure. Wind, waves, and boat traffic change a lot from an open basin to a narrow bay.
• Depth and shore. Depth off the dock, rock versus soft bottom, and swimming entry vary from one stretch of shoreline to the next.
• Drive time. The lake runs about 16 km end to end, so time to a launch, groceries, or Kingston depends on where the property sits.
• Private roads and associations. Some stretches are reached by private roads. Ask for the road maintenance arrangement and annual cost, and confirm the legal structure of any road or shoreline association before you commit.
• Township rules. The lake spans South Frontenac, Central Frontenac, and Tay Valley, so zoning, setbacks, and building permits can differ from one side to the other. Compare the rules for the specific lot, not the lake as a whole.

What should I check on a Bobs Lake property before I offer?

Check the rural essentials plus the lake-specific items above. Get a bacterial test and a flow test on the well, a septic-specific inspection, the shore road allowance status, and a clear answer on winter road access. Then confirm which township governs the lot and what RVCA will allow at the shoreline.

1. Test the well.Public Health Ontario tests private well water for E. coli and total coliforms free of charge, through Southeast Public Health drop-off locations that include the Central Frontenac and Tay Valley township offices. It does not test for chemicals. Add a flow test, and ask for the well record and tag number. RVCA counts about 610 private wells in the Bobs Lake catchment.
2. Inspect the septic.Book a septic-specific inspection, not just a general home inspection. Ask for the original permit and pump-out records.
3. Check the shore road allowance.Confirm whether the 66-foot municipal strip along the water has been closed and purchased, or still belongs to the township. See who actually owns the shoreline.
4. Confirm road access.Is the road municipally maintained year-round, seasonal, private, or is the property water-access only? The answer affects financing and insurance.
5. Confirm the township and RVCA.Check whether the lot is in South Frontenac, Central Frontenac, or Tay Valley, and ask RVCA what it will permit at the shoreline before you plan a dock or addition.
6. Ask about the fall water level.Find out how the dock, lift, and swimming area work after the mid-October drawdown.

Southeast Public Health replaced KFL&A Public Health and the Leeds, Grenville and Lanark District Health Unit on January 1, 2025, so older guides may still name those units. For more detail on wells, septic systems, shore road allowances, and waterfront insurance, read the full waterfront buying guide.