BC lake · 38.5 ha · Alberni Inlet watershed

Gracie Lake

Its median summer Secchi depth in 2009 was 14.5 m, from 1 reading.

The readings

3 summer readings on record in 2009, at 1 sampling site.

	Median, latest 10 sampled years	Compared with BC lakes
Secchi depth	14.5 m 2009, 1 reading	Too few readings (1) to compare with other lakes.
Total phosphorus	2.0 µg/L 2009, 1 reading	Too few readings (1) to compare with other lakes.
Chlorophyll a	0.5 µg/L 2009, 1 reading	Too few readings (1) to compare with other lakes.

Secchi depth how deep a black-and-white disc stays visible: deeper means clearer water

Total phosphorus the nutrient that most often feeds algae in BC lakes

Chlorophyll a the green pigment in algae: a direct measure of how much is growing

Median each year (bigger dot, more readings)Middle half of BC lakesBC median

Source: BC Environmental Monitoring Data System (EnMoDS) results, Environmental Monitoring and Analysis Branch, Province of BC, records to September 19, 2026 (Open Government Licence – British Columbia); lake outlines and names: Freshwater Atlas lakes, Province of BC (Open Government Licence – British Columbia). Summaries by PlaceDossier.

Nutrient level Inferred

Unclear: too few readings to infer a nutrient level.

Left out for too few readings (under 5 in the latest 10 sampled years): secchi depth, total phosphorus, chlorophyll a.

Year by year

Year	Secchi depth	Total phosphorus	Chlorophyll a
2009	14.5 m (1)	2.0 µg/L (1)	0.5 µg/L (1)

Median of each year's May to October readings; the number of readings is in brackets.

Where it was sampled

E277011 GRACIE LAKE 3 readings

Site names and IDs are as recorded in the provincial database; the IDs find each site's full record there.

What this record doesn't cover

Algae bloom reports and invasive mussel checks aren't in this record: the province's Algae Watch map and mussel monitoring aren't published as open data. For swimming, check the regional health authority's beach advisories; for blooms and mussels, ask the province's regional environment office or the local lake association.

Readings are from the province's monitoring database: samples taken by provincial staff, volunteer lake monitors, and companies and local governments that sample under their permits. We keep the ice-free season (May to October), and for phosphorus and chlorophyll only samples from the top 5 m. Each year's figure is the median of that year's readings; the summary is the median of every reading in the lake's latest 10 sampled years. A reading below the lab's detection limit counts at that limit. One site can be a bay rather than the open lake, so a lake's figures can differ from one end to the other.

Water quality changes with the season, the weather and the part of the lake. These are past readings, not a test of the water today: before you buy, ask the local government and the lake association what's known, and test a drinking-water intake yourself.