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MERCED RIVER - YOSEMITE NP AT HAPPY ISLES (HPIC1)
| Latitude: 37.73º N | Longitude: 119.56º W | Elevation: 4017 Feet | | Forecast Type: Official Location |
| Location: Mariposa County in California | Bulletin Group: San Joaquin | River Group: San Joaquin |
| Issuance Time: | Sep 10 2026 at 7:04 AM PDT | Next Issuance: | Sep 11 2026 at 9:00 AM PDT
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| Action: N/A | Minor Flood: 7.5 Feet | Moderate Flood: 10.0 Feet | Major Flood: 13.27 Feet |
# Tabular Observed and Forecast Hydrograph Information
#
# Location: Merced River - Yosemite NP at Happy Isles (HPIC1)
#
# File Generation Time: 09/10/2026 at 07:04 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 09/05/2026 at 08:00 AM PDT
# Maximum Observed Stage: 1.05 Feet
# Maximum Observed Flow: 17 cfs
#
# Earliest Date & Time of Maximum Forecast: 09/10/2026 at 07:00 AM PDT
# Maximum Forecast Stage: 0.85 Feet
# Maximum Forecast Flow: 10 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
09/05/2026 07 AM PDT 1.05 17 Normal
09/05/2026 08 AM PDT 1.05 17 0 Normal
09/05/2026 09 AM PDT 1.04 17 - Normal
09/05/2026 10 AM PDT 1.04 17 0 Normal
09/05/2026 11 AM PDT 1.04 17 0 Normal
09/05/2026 12 PM PDT 1.04 17 0 Normal
09/05/2026 01 PM PDT 1.04 17 0 Normal
09/05/2026 02 PM PDT 1.03 16 - Normal
09/05/2026 03 PM PDT 1.03 16 0 Normal
09/05/2026 04 PM PDT 1.03 16 0 Normal
09/05/2026 05 PM PDT 1.02 16 - Normal
09/05/2026 06 PM PDT 1.02 16 0 Normal
09/05/2026 07 PM PDT 1.02 16 0 Normal
09/05/2026 08 PM PDT 1.02 16 0 Normal
09/05/2026 09 PM PDT 1.02 16 0 Normal
09/05/2026 10 PM PDT 1.02 16 0 Normal
09/05/2026 11 PM PDT 1.02 16 0 Normal
09/06/2026 12 AM PDT 1.02 16 0 Normal
09/06/2026 01 AM PDT 1.01 16 - Normal
09/06/2026 02 AM PDT 1.01 16 0 Normal
09/06/2026 03 AM PDT 1.01 16 0 Normal
09/06/2026 04 AM PDT 1.00 15 - Normal
09/06/2026 05 AM PDT 1.00 15 0 Normal
09/06/2026 06 AM PDT 1.00 15 0 Normal
09/06/2026 07 AM PDT 1.00 15 0 Normal
09/06/2026 08 AM PDT 1.00 15 0 Normal
09/06/2026 09 AM PDT 1.00 15 0 Normal
09/06/2026 10 AM PDT 1.00 15 0 Normal
09/06/2026 11 AM PDT 0.99 15 - Normal
09/06/2026 12 PM PDT 0.99 15 0 Normal
09/06/2026 01 PM PDT 0.99 15 0 Normal
09/06/2026 02 PM PDT 0.98 14 - Normal
09/06/2026 03 PM PDT 0.98 14 0 Normal
09/06/2026 04 PM PDT 0.98 14 0 Normal
09/06/2026 05 PM PDT 0.98 14 0 Normal
09/06/2026 06 PM PDT 0.98 14 0 Normal
09/06/2026 07 PM PDT 0.98 14 0 Normal
09/06/2026 08 PM PDT 0.97 14 - Normal
09/06/2026 09 PM PDT 0.97 14 0 Normal
09/06/2026 10 PM PDT 0.97 14 0 Normal
09/06/2026 11 PM PDT 0.96 14 - Normal
09/07/2026 12 AM PDT 0.96 14 0 Normal
09/07/2026 01 AM PDT 0.96 14 0 Normal
09/07/2026 02 AM PDT 0.95 13 - Normal
09/07/2026 03 AM PDT 0.95 13 0 Normal
09/07/2026 04 AM PDT 0.95 13 0 Normal
09/07/2026 05 AM PDT 0.95 13 0 Normal
09/07/2026 06 AM PDT 0.94 13 - Normal
09/07/2026 07 AM PDT 0.94 13 0 Normal
09/07/2026 08 AM PDT 0.94 13 0 Normal
09/07/2026 09 AM PDT 0.94 13 0 Normal
09/07/2026 10 AM PDT 0.94 13 0 Normal
09/07/2026 11 AM PDT 0.93 13 - Normal
09/07/2026 12 PM PDT 0.93 13 0 Normal
09/07/2026 01 PM PDT 0.93 13 0 Normal
09/07/2026 02 PM PDT 0.93 13 0 Normal
09/07/2026 03 PM PDT 0.93 13 0 Normal
09/07/2026 04 PM PDT 0.92 12 - Normal
09/07/2026 05 PM PDT 0.92 12 0 Normal
09/07/2026 06 PM PDT 0.92 12 0 Normal
09/07/2026 07 PM PDT 0.92 12 0 Normal
09/07/2026 08 PM PDT 0.92 12 0 Normal
09/07/2026 09 PM PDT 0.92 12 0 Normal
09/07/2026 10 PM PDT 0.92 12 0 Normal
09/07/2026 11 PM PDT 0.92 12 0 Normal
09/08/2026 12 AM PDT 0.92 12 0 Normal
09/08/2026 01 AM PDT 0.92 12 0 Normal
09/08/2026 02 AM PDT 0.91 12 - Normal
09/08/2026 03 AM PDT 0.91 12 0 Normal
09/08/2026 04 AM PDT 0.91 12 0 Normal
09/08/2026 05 AM PDT 0.91 12 0 Normal
09/08/2026 06 AM PDT 0.91 12 0 Normal
09/08/2026 07 AM PDT 0.91 12 0 Normal
09/08/2026 08 AM PDT 0.90 12 - Normal
09/08/2026 09 AM PDT 0.90 12 0 Normal
09/08/2026 10 AM PDT 0.90 12 0 Normal
09/08/2026 11 AM PDT 0.90 12 0 Normal
09/08/2026 12 PM PDT 0.90 12 0 Normal
09/08/2026 01 PM PDT 0.90 12 0 Normal
09/08/2026 02 PM PDT 0.90 12 0 Normal
09/08/2026 03 PM PDT 0.89 11 - Normal
09/08/2026 04 PM PDT 0.89 11 0 Normal
09/08/2026 05 PM PDT 0.89 11 0 Normal
09/08/2026 06 PM PDT 0.89 11 0 Normal
09/08/2026 07 PM PDT 0.89 11 0 Normal
09/08/2026 08 PM PDT 0.89 11 0 Normal
09/08/2026 09 PM PDT 0.89 11 0 Normal
09/08/2026 10 PM PDT 0.89 11 0 Normal
09/08/2026 11 PM PDT 0.89 11 0 Normal
09/09/2026 12 AM PDT 0.89 11 0 Normal
09/09/2026 01 AM PDT 0.88 11 - Normal
09/09/2026 02 AM PDT 0.88 11 0 Normal
09/09/2026 03 AM PDT 0.88 11 0 Normal
09/09/2026 04 AM PDT 0.88 11 0 Normal
09/09/2026 05 AM PDT 0.88 11 0 Normal
09/09/2026 06 AM PDT 0.88 11 0 Normal
09/09/2026 07 AM PDT 0.88 11 0 Normal
09/09/2026 08 AM PDT 0.88 11 0 Normal
09/09/2026 09 AM PDT 0.88 11 0 Normal
09/09/2026 10 AM PDT 0.87 11 - Normal
09/09/2026 11 AM PDT 0.87 11 0 Normal
09/09/2026 12 PM PDT 0.87 11 0 Normal
09/09/2026 01 PM PDT 0.87 11 0 Normal
09/09/2026 02 PM PDT 0.86 10 - Normal
09/09/2026 03 PM PDT 0.86 10 0 Normal
09/09/2026 04 PM PDT 0.86 10 0 Normal
09/09/2026 05 PM PDT 0.86 10 0 Normal
09/09/2026 06 PM PDT 0.86 10 0 Normal
09/09/2026 07 PM PDT 0.86 10 0 Normal
09/09/2026 08 PM PDT 0.86 10 0 Normal
09/09/2026 09 PM PDT 0.86 10 0 Normal
09/09/2026 10 PM PDT 0.86 10 0 Normal
09/09/2026 11 PM PDT 0.86 10 0 Normal
09/10/2026 12 AM PDT 0.86 10 0 Normal
09/10/2026 01 AM PDT 0.86 10 0 Normal
09/10/2026 02 AM PDT 0.86 10 0 Normal
09/10/2026 03 AM PDT 0.86 10 0 Normal
09/10/2026 04 AM PDT 0.86 10 0 Normal
09/10/2026 05 AM PDT 0.85 10 - Normal
09/10/2026 06 AM PDT 0.85 10 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
09/10/2026 07 AM PDT 0.85 10 Normal
09/10/2026 08 AM PDT 0.85 10 0 Normal
09/10/2026 09 AM PDT 0.85 10 0 Normal
09/10/2026 10 AM PDT 0.85 10 0 Normal
09/10/2026 11 AM PDT 0.85 10 0 Normal
09/10/2026 12 PM PDT 0.85 10 0 Normal
09/10/2026 01 PM PDT 0.85 10 0 Normal
09/10/2026 02 PM PDT 0.85 10 0 Normal
09/10/2026 03 PM PDT 0.85 10 0 Normal
09/10/2026 04 PM PDT 0.85 10 0 Normal
09/10/2026 05 PM PDT 0.85 10 0 Normal
09/10/2026 06 PM PDT 0.85 10 0 Normal
09/10/2026 07 PM PDT 0.85 10 0 Normal
09/10/2026 08 PM PDT 0.85 10 0 Normal
09/10/2026 09 PM PDT 0.85 10 0 Normal
09/10/2026 10 PM PDT 0.85 10 0 Normal
09/10/2026 11 PM PDT 0.85 10 0 Normal
09/11/2026 12 AM PDT 0.85 10 0 Normal
09/11/2026 01 AM PDT 0.84 10 - Normal
09/11/2026 02 AM PDT 0.84 10 0 Normal
09/11/2026 03 AM PDT 0.84 10 0 Normal
09/11/2026 04 AM PDT 0.84 10 0 Normal
09/11/2026 05 AM PDT 0.84 10 0 Normal
09/11/2026 06 AM PDT 0.84 10 0 Normal
09/11/2026 07 AM PDT 0.84 10 0 Normal
09/11/2026 08 AM PDT 0.84 10 0 Normal
09/11/2026 09 AM PDT 0.84 10 0 Normal
09/11/2026 10 AM PDT 0.84 10 0 Normal
09/11/2026 11 AM PDT 0.84 10 0 Normal
09/11/2026 12 PM PDT 0.84 10 0 Normal
09/11/2026 01 PM PDT 0.84 10 0 Normal
09/11/2026 02 PM PDT 0.84 10 0 Normal
09/11/2026 03 PM PDT 0.84 10 0 Normal
09/11/2026 04 PM PDT 0.84 10 0 Normal
09/11/2026 05 PM PDT 0.84 10 0 Normal
09/11/2026 06 PM PDT 0.84 10 0 Normal
09/11/2026 07 PM PDT 0.84 10 0 Normal
09/11/2026 08 PM PDT 0.84 10 0 Normal
09/11/2026 09 PM PDT 0.84 10 0 Normal
09/11/2026 10 PM PDT 0.84 10 0 Normal
09/11/2026 11 PM PDT 0.84 10 0 Normal
09/12/2026 12 AM PDT 0.84 10 0 Normal
09/12/2026 01 AM PDT 0.84 10 0 Normal
09/12/2026 02 AM PDT 0.84 10 0 Normal
09/12/2026 03 AM PDT 0.84 10 0 Normal
09/12/2026 04 AM PDT 0.84 10 0 Normal
09/12/2026 05 AM PDT 0.84 10 0 Normal
09/12/2026 06 AM PDT 0.84 10 0 Normal
09/12/2026 07 AM PDT 0.84 10 0 Normal
09/12/2026 08 AM PDT 0.84 10 0 Normal
09/12/2026 09 AM PDT 0.84 10 0 Normal
09/12/2026 10 AM PDT 0.84 10 0 Normal
09/12/2026 11 AM PDT 0.84 10 0 Normal
09/12/2026 12 PM PDT 0.84 10 0 Normal
09/12/2026 01 PM PDT 0.84 10 0 Normal
09/12/2026 02 PM PDT 0.84 10 0 Normal
09/12/2026 03 PM PDT 0.84 10 0 Normal
09/12/2026 04 PM PDT 0.84 10 0 Normal
09/12/2026 05 PM PDT 0.84 10 0 Normal
09/12/2026 06 PM PDT 0.84 10 0 Normal
09/12/2026 07 PM PDT 0.84 10 0 Normal
09/12/2026 08 PM PDT 0.84 10 0 Normal
09/12/2026 09 PM PDT 0.84 10 0 Normal
09/12/2026 10 PM PDT 0.84 10 0 Normal
09/12/2026 11 PM PDT 0.84 10 0 Normal
09/13/2026 12 AM PDT 0.84 10 0 Normal
09/13/2026 01 AM PDT 0.83 9 - Normal
09/13/2026 02 AM PDT 0.83 9 0 Normal
09/13/2026 03 AM PDT 0.83 9 0 Normal
09/13/2026 04 AM PDT 0.83 9 0 Normal
09/13/2026 05 AM PDT 0.83 9 0 Normal
09/13/2026 06 AM PDT 0.83 9 0 Normal
09/13/2026 07 AM PDT 0.83 9 0 Normal
09/13/2026 08 AM PDT 0.83 9 0 Normal
09/13/2026 09 AM PDT 0.83 9 0 Normal
09/13/2026 10 AM PDT 0.83 9 0 Normal
09/13/2026 11 AM PDT 0.83 9 0 Normal
09/13/2026 12 PM PDT 0.83 9 0 Normal
09/13/2026 01 PM PDT 0.83 9 0 Normal
09/13/2026 02 PM PDT 0.83 9 0 Normal
09/13/2026 03 PM PDT 0.83 9 0 Normal
09/13/2026 04 PM PDT 0.83 9 0 Normal
09/13/2026 05 PM PDT 0.83 9 0 Normal
09/13/2026 06 PM PDT 0.83 9 0 Normal
09/13/2026 07 PM PDT 0.83 9 0 Normal
09/13/2026 08 PM PDT 0.83 9 0 Normal
09/13/2026 09 PM PDT 0.83 9 0 Normal
09/13/2026 10 PM PDT 0.83 9 0 Normal
09/13/2026 11 PM PDT 0.83 9 0 Normal
09/14/2026 12 AM PDT 0.83 9 0 Normal
09/14/2026 01 AM PDT 0.83 9 0 Normal
09/14/2026 02 AM PDT 0.83 9 0 Normal
09/14/2026 03 AM PDT 0.83 9 0 Normal
09/14/2026 04 AM PDT 0.83 9 0 Normal
09/14/2026 05 AM PDT 0.83 9 0 Normal
09/14/2026 06 AM PDT 0.83 9 0 Normal
09/14/2026 07 AM PDT 0.83 9 0 Normal
09/14/2026 08 AM PDT 0.83 9 0 Normal
09/14/2026 09 AM PDT 0.83 9 0 Normal
09/14/2026 10 AM PDT 0.83 9 0 Normal
09/14/2026 11 AM PDT 0.83 9 0 Normal
09/14/2026 12 PM PDT 0.83 9 0 Normal
09/14/2026 01 PM PDT 0.83 9 0 Normal
09/14/2026 02 PM PDT 0.83 9 0 Normal
09/14/2026 03 PM PDT 0.83 9 0 Normal
09/14/2026 04 PM PDT 0.83 9 0 Normal
09/14/2026 05 PM PDT 0.83 9 0 Normal
09/14/2026 06 PM PDT 0.83 9 0 Normal
09/14/2026 07 PM PDT 0.83 9 0 Normal
09/14/2026 08 PM PDT 0.83 9 0 Normal
09/14/2026 09 PM PDT 0.83 9 0 Normal
09/14/2026 10 PM PDT 0.83 9 0 Normal
09/14/2026 11 PM PDT 0.83 9 0 Normal
09/15/2026 12 AM PDT 0.83 9 0 Normal
09/15/2026 01 AM PDT 0.83 9 0 Normal
09/15/2026 02 AM PDT 0.83 9 0 Normal
09/15/2026 03 AM PDT 0.83 9 0 Normal
09/15/2026 04 AM PDT 0.83 9 0 Normal
09/15/2026 05 AM PDT 0.83 9 0 Normal
#
# NOTE 1: Stages are rounded to the nearest hundredth (.01) of a foot.
# NOTE 2: Flows are rounded to the nearest (1) cfs.
# NOTE 3: Trends are determined using hourly change in unrounded stage and flow.
# NOTE 4: Maximum Values are determined using unrounded stage and flow.
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