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The linked gauge for Blue Marsh Lake reported 290.11 ft at its latest stored observation on Oct 11, 2026, on a falling 30-day trend (-0.06 ft).
Local gage height: 290.11 ft
-0.06 ft net change over past 30 days
Deepest basin sounding across ~1,147 acres
Refreshing (60–70°F) · Cool swim · Moderate comfort
Tulpehocken Cr at Blue Marsh Damsite near Reading · Oct 11, 2:15 PM UTC
| Observation Date | Gage height (ft) | 24h Change | Approval Status |
|---|---|---|---|
| Fri, Oct 9, 2026 | 290.10 | 0.00 ft | Provisional |
| Thu, Oct 8, 2026 | 290.10 | +0.02 ft | Provisional |
| Wed, Oct 7, 2026 | 290.08 | +0.03 ft | Provisional |
| Tue, Oct 6, 2026 | 290.05 | -0.01 ft | Provisional |
| Mon, Oct 5, 2026 | 290.06 | -0.02 ft | Provisional |
| Sun, Oct 4, 2026 | 290.08 | -0.05 ft | Provisional |
| Sat, Oct 3, 2026 | 290.13 | -0.03 ft | Provisional |
| Fri, Oct 2, 2026 | 290.16 | +0.01 ft | Provisional |
| Thu, Oct 1, 2026 | 290.15 | -0.08 ft | Provisional |
| Wed, Sep 30, 2026 | 290.23 | -0.10 ft | Provisional |
| Tue, Sep 29, 2026 | 290.33 | -0.06 ft | Provisional |
| Mon, Sep 28, 2026 | 290.39 | +0.12 ft | Approved |
| Sun, Sep 27, 2026 | 290.27 | +0.15 ft | Approved |
| Sat, Sep 26, 2026 | 290.12 | — | Approved |
Current index calculated from verified local atmospheric, hydrographic & alert inputs.
Poor for swimming (49/100), from 5 available inputs. Supporting this: No active official alerts for this lake. 4% chance of precipitation. Working against it: Air temperature 55°F. The forecast mentions thunderstorms, which carries a risk penalty. Confidence is moderate (75%) because some inputs are unavailable or older than ideal.