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The quick read: Okanagan Lake sat at about 341.34 metres on October 29, the lowest October level in the Water Survey of Canada record going back to 1943. Kelowna has had just 47 percent of its normal rain this year, and the valley is in its fourth straight year of drought, with groundwater, streams, and lake levels all still under severe stress despite the autumn rain.

The rain that fell this autumn did not end the Okanagan's drought.

It barely dented it.

The Okanagan Basin Water Board's latest drought brief, with data to October 29, shows a valley still running dry on almost every measure that matters.

Through October 1, Kelowna had received about 111 millimetres of precipitation, roughly 47 percent of normal.

Vernon was at about 59 percent, and Penticton at 42 percent.

The deficit gets worse from north to south, and it has persisted through spring and summer.

Okanagan Lake tells the story most plainly.

On October 29, the lake sat at about 341.34 metres.

That is lower than at any point in October in the Water Survey of Canada record, which begins in 1943.

The previous October low was 341.39 metres, set in 2003.

The spring freshet, the snowmelt surge that refills the lake, was less than half of normal this year.

It peaked early and ended early.

In late May, weekly net inflow reached only about 15,000 to 17,000 acre-feet, against an average freshet peak near 50,000.

Net inflows turned negative and the lake started dropping by the end of June.

In an average year, that does not happen until August.

Kalamalka Lake is at about 390.75 metres, and Osoyoos Lake at 277.69 metres.

In early September, Kalamalka fell so low that water could no longer flow into Vernon Creek, a condition known as dead pooling.

It was the lowest level recorded since the lake's control structures were installed.

Underground and in the creeks

The stress is not only on the surface.

Most monitored groundwater wells are below their historical median for this time of year.

Seventeen of the 28 reporting wells are much below normal this week.

Most wells crossed into below-normal in April and May and have stayed there.

Bedrock wells are in the worst shape, with most near or below the 10th percentile of their records.

Streams tell the same story.

Many monitored streams fell from near- or above-normal flows early in the year to below-normal flows by late spring, and stayed depressed through July and August.

By late summer, numerous natural streams were within the lowest historical percentile ranges.

Warm water made it worse.

At Mission Creek near East Kelowna, water temperatures sat above the 19-degree salmonid stress threshold for much of August.

They passed the 21-degree threshold that blocks Okanagan sockeye migration for several days during the warmest stretch.

Across the basin, 93 gauge-weeks reached or passed 19 degrees this year.

Four dry years running

This is the Okanagan's fourth consecutive year of drought.

North Okanagan growers received just 30 percent of their usual water allocation this past season.

Consultations on Canada's first national water security strategy wrapped up on October 25.

BC farm groups were among those making submissions, calling for action and for investment of up to $1 billion in agricultural water infrastructure.

The seasonal forecast offers little comfort.

Environment and Climate Change Canada gives a 64 percent probability of above-normal temperatures for the Okanagan through November.

Warmer fall weather prolongs evaporation and outdoor water demand, and delays the seasonal drop in water losses.

The Water Board's conclusion is blunt: substantial and sustained precipitation would be needed to materially improve the valley's position heading into winter.

The lake is not a tank that refills each spring.

Only about 1.7 percent of its volume is replaced in any year.

A run of dry years like 2022 to 2026 draws it down faster than an average year puts back.

The rain helped, but the valley is still spending water it does not have.

Sources: Okanagan Basin Water Board drought brief, data to October 29, 2026; Country Life in BC, November 4, 2026. Some figures are provisional real-time data, subject to revision by the collecting agencies.