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The linked gauge for Big Manistique Lake reported 579.21 ft (relative to IGLD 1985) at its latest stored observation on Oct 10, 2026, on a falling 30-day trend (-0.50 ft).
Special Weather Statement issued October 10 at 5:47PM EDT by NWS Marquette MI
Local gage height: 579.21 ft
-0.50 ft net change over past 30 days
Verified freshwater recreation waterbody
Brisk (50–60°F) · Cold shock risk · Wetsuit recommended
Port Inland, MI · Oct 10, 2:24 PM UTC
| Observation Date | Gage height (ft) | 24h Change | Approval Status |
|---|---|---|---|
| Fri, Oct 9, 2026 | 578.75 | -0.01 ft | Provisional |
| Thu, Oct 8, 2026 | 578.77 | -0.16 ft | Provisional |
| Wed, Oct 7, 2026 | 578.93 | -0.16 ft | Provisional |
| Tue, Oct 6, 2026 | 579.09 | +0.39 ft | Provisional |
| Mon, Oct 5, 2026 | 578.70 | -0.41 ft | Provisional |
| Sun, Oct 4, 2026 | 579.11 | +0.15 ft | Provisional |
| Sat, Oct 3, 2026 | 578.96 | +0.05 ft | Provisional |
| Fri, Oct 2, 2026 | 578.90 | -0.14 ft | Provisional |
| Thu, Oct 1, 2026 | 579.04 | -0.13 ft | Provisional |
| Wed, Sep 30, 2026 | 579.17 | +0.16 ft | Provisional |
| Tue, Sep 29, 2026 | 579.00 | +0.04 ft | Provisional |
| Mon, Sep 28, 2026 | 578.97 | -0.05 ft | Provisional |
| Sun, Sep 27, 2026 | 579.01 | 0.00 ft | Provisional |
| Sat, Sep 26, 2026 | 579.02 | — | Provisional |
Current index calculated from verified local atmospheric, hydrographic & alert inputs.
Very Poor / Avoid for swimming (25/100), from 5 available inputs. Supporting this: 1% chance of precipitation. Wind 15 mph from the south. Working against it: Measured water temperature 57°F from a representative gauge 19.8 mi away. Provisional data. Cold water hazard: thermal protection recommended below 60°F. Active moderate alert: Special Weather Statement. Water temperature is 57°F (below 60°F). Immersion requires thermal protection. Confidence is moderate (75%) because some inputs are unavailable or older than ideal.