Renfrew County Lake Quality

Ontario, 83 lakes, average grade A (Excellent)

Renfrew County has 83 graded lakes, enough that within-county variation matters as much as the county average. Some are deep glacial basins, others are shallow agricultural-watershed waters, and the grade distribution reflects that mix. The county's average grade is A — among the cleanest in Ontario. 67 lakes pull an A on their own, and almost none fall into the D or F brackets.

Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Aird Lake (A) is the cleanest in the county.

Loading map…

Quick Answers for Renfrew County

Cleanest lakes in Renfrew County →Cleanest lakes in Ontario →Safest swimming lakes in Ontario →

Planning a trip? Check special fishing regulations for Aird Lake — or check the official Ontario fishing regulations.

All Lakes in Renfrew County

Rank	Lake	Grade	Clarity	Phosphorus
1	Aird Lake	A	16.4 ft	-
2	Bagot Long Lake	A	15.1 ft	13.5 µg/L
3	Big Limestone Lake	A	16.4 ft	7.1 µg/L
4	Brewster Lake	A	16.4 ft	11 µg/L
5	Burns Lake	A	-	9.1 µg/L
6	Carson Lake	A	20.3 ft	-
7	Charlotte Lake	A	23 ft	-
8	Colton Lake	A	15.1 ft	5.9 µg/L
9	Dam Lake	A	16.4 ft	8.3 µg/L
10	Dempseys Lake	A	20 ft	9.8 µg/L
11	Dore Lake	A	15.1 ft	11.8 µg/L
12	Garden Lake	A	16.4 ft	-
13	Green Lake	A	26.7 ft	7.1 µg/L
14	Halfway Lake	A	16.1 ft	6.6 µg/L
15	Jeffreys Lake	A	20.7 ft	7.9 µg/L
16	Kulas Lake	A	15.1 ft	7.2 µg/L
17	Lake Clear	A	23.1 ft	9.1 µg/L
18	Lepine Lake	A	17.6 ft	5.3 µg/L
19	Mcmaster Lake	A	15.6 ft	5.6 µg/L
20	Mink Lake	A	15.4 ft	7.8 µg/L
21	Norway Lake	A	20 ft	7.5 µg/L
22	Paugh Lake	A	15.4 ft	7.8 µg/L
23	Plebon Lake	A	17.1 ft	-
24	Rattrays Lake	A	-	10.3 µg/L
25	Spectacle Lake	A	17.1 ft	5.5 µg/L
26	Sullivan Lake	A	16.1 ft	-
27	Trout Lake	A	18 ft	5.2 µg/L
28	Wadsworth Lake	A	15.4 ft	7.2 µg/L
29	Franks Lake	A	-	8.4 µg/L
30	Astrolabe Lake	A	-	8 µg/L
31	Britchless Lake	A	-	12.8 µg/L
32	Burns Lake	A	-	6.5 µg/L
33	Centennial Lake	A	-	10.9 µg/L
34	Clear Lake	A	-	12.2 µg/L
35	Constant Lake	A	-	15.7 µg/L
36	Dodge Lake	A	-	8.7 µg/L
37	Genricks Lake	A	-	8 µg/L
38	Green Lake	A	-	7.4 µg/L
39	Grimsthorpe Lake	A	-	13.6 µg/L
40	Island Lake	A	-	4.3 µg/L
41	Lazy Lake	A	-	8.1 µg/L
42	Leclair Lake	A	-	7.7 µg/L
43	Murphys Lake	A	-	3.3 µg/L
44	Norlock Lake	A	-	5.8 µg/L
45	Patersons Lake	A	-	16.4 µg/L
46	Schavens Lake	A	-	7.3 µg/L
47	Smith Lake	A	-	15.2 µg/L
48	Stoney Lake	A	-	10 µg/L
49	Tee Lake	A	-	18.5 µg/L
50	Upper Mallard Lake	A	-	9.4 µg/L
51	Windigo Lake	A	-	6.6 µg/L
52	Jacks Lake	A	-	7.9 µg/L
53	Murphy'S Lake	A	17.1 ft	8.2 µg/L
54	Bark Lake	A	11.3 ft	7.1 µg/L
55	Calabogie Lake	A	11.5 ft	9.6 µg/L
56	Cameron Lake	A	11.5 ft	5.9 µg/L
57	Diamond Lake	A	12.5 ft	8.1 µg/L
58	Golden Lake	A	11.2 ft	9 µg/L
59	Hurds Lake	A	14.8 ft	7.4 µg/L
60	Kuiack Lake	A	13.5 ft	11.6 µg/L
61	Long Lake	A	11.5 ft	9.2 µg/L
62	Madawaska River Lake	A	13.8 ft	7.3 µg/L
63	Mcsourley Lake	A	11.5 ft	6.2 µg/L
64	Morrow Lake	A	13.6 ft	8.5 µg/L
65	Raglan White Lake	A	11.5 ft	8.5 µg/L
66	Round Lake	A	11.5 ft	6.2 µg/L
67	Stones Lake	A	13.1 ft	9.1 µg/L
68	Big Gibson Lake	B	9.8 ft	7 µg/L
69	Black Donald Lake	B	13.8 ft	-
70	Doyne Lake	B	9.8 ft	10.6 µg/L
71	Lower Pergeon Lake	B	9.8 ft	9.2 µg/L
72	Valiant Lake	B	9.8 ft	13.6 µg/L
73	Wendigo Lake	B	9.8 ft	11.7 µg/L
74	Westport Sand Lake	B	8.2 ft	12 µg/L
75	Gorman Lake	B	-	23 µg/L
76	Balmer Lake	B	9.2 ft	9.3 µg/L
77	Kelly Lake	B	8.2 ft	13 µg/L
78	Waterloo Lake	B	9.8 ft	4.4 µg/L
79	Allumette Lake	B	5.7 ft	13.5 µg/L
80	Lower Allumette Lake	B	6.6 ft	13.4 µg/L
81	Lac Dec Chats Lake	C	8.5 ft	-
82	Muskrat Lake	C	5.9 ft	29.7 µg/L
83	Redpine Lake	C	9.2 ft	-