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  Caesarea marina
Fishing on Lake Scugog near Caesarea

The Lake Scugog watershed is located in the southwest portion of the Kawartha Conservation watershed.

Water enters through subwatersheds flowing northward off of the Oak Ridges Moraine, and also from the surrounding lands on the north end of the lake. Water exits the lake through the northeastern arm, and flows northward through Lindsay into Sturgeon Lake. A major tributary to Lake Scugog is the Nonquon River.

Subwatershed Characteristics

  • Subwatershed area: 141 km² or 14061 ha
  • Waterbody Area: 66 km² or 6,578 ha
  • Total watercourse length:180 km
  • Density of watercourses: 0.87 km/km²

Physical Characteristics

Physiographic Region Area (ha) Area (km²) % of Watershed
Peterborough Drumlin Field 4309 43 21
Schomberg Clay Plains 16290 163 79

Natural Cover

  • Forest Interior (100 m): 441 ha
  • Forest Interior (200 m): 51 ha
  • Dominant Forest Type: Deciduous Forest
  • Natural Cover: 3.7%
  • Riparian Areas: 689 ha

Provincially Significant Wetlands

  • East Cross Creek No.15: 143 ha
  • Lake Scugog Marsh (Osler Marsh): 417 ha
  • Lake Scugog No.17: 209 ha
  • Lake Scugog No.19: 697 ha
  • Lake Scugog No.23: 17 ha
  • Newman's Beach West No.63: 133 ha
  • Nonquon River Mouth Wetland Complex: 48 ha
  • Scugog River and Mariposa Brook: 20 ha
  • Seven Mile Island Wetland: 157 ha
  • Valentia South: 169 ha

ANSI - Life Science

  • Valentia Marsh: 493 ha
  • Scugog Marsh: 705 ha

2013 Grades

The follow grades are based on monitoring data from 2007 to 2011.

Lake - Surface Water Quality

Total Phosphorus 0.021 mg/L C Fair

The surface water quality grade for Lake Scugog is based on Total Phosphorus lake data. The Total Phosphorus level is 0.021 mg/L, and is above the provincial guideline of 0.02 mg/L.

Subwatershed - Surface Water Quality

Total Phosphorus 0.059 mg/L C Fair

The surface water quality grade for the Lake Scugog watershed is based on Total Phosphorus stream data. The Total Phosphorus level is 0.059 mg/L, and is above the provincial guideline of 0.03 mg/L.

Forest Conditions

IndicatorArea CoverPercent CoverGradeStatus
Forest Cover 31.72 km² 22.58% C Fair
Forest Interior 4.41 km² 3.14% D Poor
Forested Riparian Cover 4.65 km² 38.27% C Fair

The combined forest conditions grade for the Lake Scugog subwatershed is ranked as fair.

Wetland Conditions

IndicatorArea CoverPercent CoverGradeStatus
Wetland Cover 22.08 km² 10.71% B Good


Water levels

See the Lake Scugog monitoring station on the map at


The Lake Scugog subwatershed includes a large amount of urban, or built-up, areas, and shoreline development. Nutrients and other contaminants on lawns, driveways, parking lots, and roads can be easily washed into the stormwater system and tributaries, or directly from shoreline properties into the lake. Property owners everywhere within the subwatershed have an important role in protecting the lake.

Shoreline property owners

Healthy shorelines contribute to the health of Lake Scugog. Create or maintain a 3 metre or larger buffer along the shoreline using native plants with deep roots. The plants will help prevent soil erosion and ice damage with their roots, and filter nutrients and other sediments in surface water runoff. Avoid cutting the grass all the way to the water. Click here for more about shoreline protection.

Maintain your septic system to ensure it is working properly. Be sure to have it pumped regularly, and upgraded when needed. Click here for details.

Urban property owners

Runoff through the stormwater system from residential and commercial areas adds a high concentration of phosphorus and other contaminants. As a property owner in the subwatershed, whether residential or commercial, you can help by reducing fertilizer use, picking up pet waste, preventing soil erosion, and keeping oil and other toxic fluids from dripping onto the driveway, lawn, or parking lot. Click here for more about urban stewardship.

Check to see if funding is available through the Scugog WATER Fund to undertake protection projects and upgrades.

Farmers and rural property owners

Agricultural operations in the subwatershed, which make up over 35 % of land use, need to ensure soils do not erode, while minimizing nutrients in surface water runoff. Click here for tips on nutrient reduction and erosion control.

Trees could also be planted to increase forest cover, and help filter surface water. Natural cover along tributaries is especially important, as it also helps reduce erosion of the banks. Click here for more about trees.

The amount of existing is excellent and needs to be maintained. Click here for more about wetlands.

Subwatershed Menu

Use the drop-down menu or click the subwatershed on the map and follow the link.


Do you need a custom map?

We create and print maps that show different types of geographical information.

Click here for details