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The linked gauge for John Martin Reservoir reported 3805.72 ft at its latest stored observation on Oct 9, 2026, on a rising 30-day trend (+4.45 ft).
Local gage height: 3805.72 ft
+4.45 ft net change over past 30 days
Verified freshwater recreation waterbody
Refreshing (60–70°F) · Cool swim · Moderate comfort
Nearby river temperature: 65.5°F at ARKANSAS RIVER BELOW JOHN MARTIN RESERVOIR, CO. (0.3 mi away) · Oct 9, 11:00 PM UTC
| Observation Date | Gage height (ft) | 24h Change | Approval Status |
|---|---|---|---|
| Thu, Oct 8, 2026 | 3805.62 | +0.49 ft | Provisional |
| Mon, Oct 5, 2026 | 3805.13 | +0.44 ft | Provisional |
| Sun, Oct 4, 2026 | 3804.69 | +0.94 ft | Provisional |
| Sat, Oct 3, 2026 | 3803.75 | +1.22 ft | Provisional |
| Fri, Oct 2, 2026 | 3802.53 | +1.03 ft | Provisional |
| Thu, Oct 1, 2026 | 3801.50 | +0.47 ft | Provisional |
| Wed, Sep 30, 2026 | 3801.03 | -0.20 ft | Provisional |
| Tue, Sep 29, 2026 | 3801.23 | -0.15 ft | Provisional |
| Mon, Sep 28, 2026 | 3801.38 | -0.01 ft | Provisional |
| Sun, Sep 27, 2026 | 3801.39 | -0.01 ft | Provisional |
| Sat, Sep 26, 2026 | 3801.40 | +0.08 ft | Provisional |
| Fri, Sep 25, 2026 | 3801.32 | +0.02 ft | Provisional |
| Thu, Sep 24, 2026 | 3801.30 | +0.14 ft | Provisional |
| Wed, Sep 23, 2026 | 3801.16 | — | Provisional |
Direct in-situ sensor data is required to compute numeric suitability.
Water temperature is not available from a verified source for this lake. No swimming score is shown without it.