| River | Flow (cfs) | Status | |
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Water exits through the Mossy River dam at Terin's Landing. When the lake is high, the river channel itself — not the dam — limits outflow to ~500 cfs. In 2011, inflow peaked at 60,000 cfs. The lake rose.
Live readings from Water Survey of Canada (their realtime feed holds roughly the past few weeks). Faint line = raw gauge swing — the seiche, the lake rocking back and forth on wind and pressure, a real oscillation around the true level. Bold line = the true lake level with that slosh averaged out.
The 2026 season opened with 160–185 mm SWE near Riding Mountain — the highest recorded snowpack in this dataset, exceeding even 2011 and 2014. Despite that record-setting starting volume, the basin handled it: high-elevation headwaters broke April 14, ran hard through late April, then receded cleanly without ever pushing the lake into the Most Likely peak band. By mid-May the snowpack story was over. The high water that followed came from rain, not snow. Based on HFC field measurements (March 9–12) · Estimated · April 14, 2026
Receive an alert when the lake makes a real, sustained move across a key threshold. Brief wind swings and ripples across the line do not trigger a notice.