Eva Lake

Where Eva Lake is

Eva Lake lies in the District of Rainy River.

How deep is Eva Lake?

The deepest mapped contour on Eva Lake is 45.7 meters, and the water within that boundary descends even farther. Ontario’s bathymetry record holds 26 depth contours for Eva Lake.

See also Ontario's Largest and Deepest Lakes

Surveyed Depths

Ontario has surveyed the depths of several thousand of its lakes over more than half a century. Later surveys were conducted by boat with satellite positioning and produced hundreds of thousands of soundings per lake. Earlier surveys were charted by running transects across the water and drawing depth contours by hand.

Water quality

Ontario’s Lake Partner Program is a volunteer monitoring network. Participants collect water samples for phosphorus analysis and measure water clarity through the summer with a Secchi disk. Most sites are sampled for phosphorus once a year, in spring, and some several times a year between spring and fall. Phosphorus in many lakes rises through the summer, so the two kinds of average are measured on different bases.

Phosphorus is the nutrient that controls how much algae a lake can grow. A lake with little phosphorus stays clear and supports cold-water fish such as lake trout. As phosphorus rises, algae increase, the water clouds, and oxygen in the deep water falls as the algae decay. The province classifies each monitoring site by its average phosphorus:

• Oligotrophic, below 10 micrograms per litre: clear water and low algae.
• Mesotrophic, from 10 to 20: moderately productive water, with more algae and weed growth than an oligotrophic lake but rarely a bloom.
• Eutrophic, above 20: nutrient-rich water, prone to algal blooms and low oxygen at depth.

Eva Lake has 3 Lake Partner monitoring sites. Two have reported phosphorus for the three or more years the province requires before a status is assigned. All are classified oligotrophic.

The longest record is held by site 1407/1 at east, with phosphorus sampled once a year over 4 years to 2025. Its long-term mean phosphorus concentration is 7.7 micrograms per litre, within the oligotrophic band, which extends to 10.

A Secchi disk is a white or black-and-white plate lowered on a marked line until it disappears from view. The depth at which it vanishes is the Secchi depth, a direct measure of water clarity. Clearer water gives a deeper reading.

The 1 clarity readings at site 1407/1 give a median Secchi depth of 3.0 meters.

See also Lake Water Quality and Blue-Green Algae in Ontario

Fish in Eva Lake

Ontario’s aquatic resource records name 18 fish species in Eva Lake. The province’s other records for the lake name one further species, walleye. It appears in the records below.

Popular species in the province’s records

• Lake Trouttrout and whitefish
• Lake Whitefishtrout and whitefish
• Ciscotrout and whitefish
• Northern Pikepike
• Walleyeperch
• Yellow Perchperch
• Smallmouth Basssunfish
• Pumpkinseedsunfish
• Burbotcod

Stocking history

Ontario’s stocking records for Eva Lake run from 1946 to 1968 and hold 6 releases. Lake Trout account for most of the fish: 31,125 released in six of the years between 1946 and 1968. The last recorded release was 2,000 lake trout yearlings in 1968.

The province’s record of stocking for recreational fishing, kept from 2016, lists no release into Eva Lake.

Eating the fish

The 2026 Guide to Eating Ontario Fish carries consumption advice for six species taken from Eva Lake, tested for contaminants at a sampling location in Rainy River Dist. Each figure below is the most meals a month the guide advises for a fish of that length. Where mercury sets the advice, the figure falls as the fish gets longer, because mercury accumulates over a fish’s life. Where the guide has no result yet for certain contaminants at a location, it sets a precautionary limit of 16 meals a month. A zero means the guide advises no meals of that fish at that size.

General population: adultsSensitive population: children under fifteen, women who are or may become pregnant

Fisheries Management Zone 5

Eva Lake lies in Fisheries Management Zone 5. Ontario sets its fishing seasons and catch limits by zone.

Fisheries management zones around Eva Lake

Zone-wide, Smelt may not be used as bait or possessed for use as bait.

See also Fishing Seasons in Ontario, Zone by Zone and Fish Stocking in Ontario Lakes

Islands and names

Eva Lake contains 24 islands in the Ontario Hydro Network’s outline, zero of them over 10 hectares and eleven under a tenth of a hectare.

Official names

Ontario’s geographic names register lists 5 official names on the water and its islands: 2 islands and three bays. A further 1 named point stands on the mainland shore.

Bays 3

• East Bay
• Gateway Bay
• Northeast Bay

Points on the shore 1

• Sunrise Point

Nearby lakes

• Marmion Lake33 km away
• Lac des Mille Lacs49 km away
• Upper Shebandowan Lake53 km away
• Middle Shebandowan Lake65 km away

All lakes

Questions about Eva Lake

• How deep is Eva Lake?

  Its deepest charted contour is 45.7 meters, and the water within it is deeper.

• How big is Eva Lake?

  Its surface covers 17.5 square kilometers and it holds 24 islands. Of its 73 kilometers of shoreline, 67 kilometers is the mainland shore and 6 kilometers is the shore of the islands.

• What fish are in Eva Lake?

  Ontario’s aquatic resource records name eighteen species, among them lake trout, smallmouth bass, northern pike, lake whitefish and yellow perch. The lake’s spawning, consumption and stocking records also name walleye.

• Is the water clear?

  All two monitoring sites with a phosphorus status are classified oligotrophic, the clearest of the province’s three bands.