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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: | Aug 16 2026 at 7:16 AM PDT | Next Issuance: | Aug 17 2026 at 9:00 AM PDT
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| Action/Monitor: 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: 08/16/2026 at 07:16 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 08/15/2026 at 03:00 PM PDT
# Maximum Observed Stage: 1.41 Feet
# Maximum Observed Flow: 38 cfs
#
# Earliest Date & Time of Maximum Forecast: 08/16/2026 at 08:00 AM PDT
# Maximum Forecast Stage: 1.38 Feet
# Maximum Forecast Flow: 36 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
08/11/2026 07 AM PDT 1.30 31 Normal
08/11/2026 08 AM PDT 1.30 31 0 Normal
08/11/2026 09 AM PDT 1.30 31 0 Normal
08/11/2026 10 AM PDT 1.30 31 0 Normal
08/11/2026 11 AM PDT 1.30 31 0 Normal
08/11/2026 12 PM PDT 1.30 31 0 Normal
08/11/2026 01 PM PDT 1.29 30 - Normal
08/11/2026 02 PM PDT 1.28 29 - Normal
08/11/2026 03 PM PDT 1.28 29 0 Normal
08/11/2026 04 PM PDT 1.28 29 0 Normal
08/11/2026 05 PM PDT 1.28 29 0 Normal
08/11/2026 06 PM PDT 1.28 29 0 Normal
08/11/2026 07 PM PDT 1.27 29 - Normal
08/11/2026 08 PM PDT 1.27 29 0 Normal
08/11/2026 09 PM PDT 1.27 29 0 Normal
08/11/2026 10 PM PDT 1.27 29 0 Normal
08/11/2026 11 PM PDT 1.27 29 0 Normal
08/12/2026 12 AM PDT 1.27 29 0 Normal
08/12/2026 01 AM PDT 1.27 29 0 Normal
08/12/2026 02 AM PDT 1.27 29 0 Normal
08/12/2026 03 AM PDT 1.26 28 - Normal
08/12/2026 04 AM PDT 1.26 28 0 Normal
08/12/2026 05 AM PDT 1.26 28 0 Normal
08/12/2026 06 AM PDT 1.26 28 0 Normal
08/12/2026 07 AM PDT 1.26 28 0 Normal
08/12/2026 08 AM PDT 1.26 28 0 Normal
08/12/2026 09 AM PDT 1.28 29 + Normal
08/12/2026 10 AM PDT 1.28 29 0 Normal
08/12/2026 11 AM PDT 1.28 29 0 Normal
08/12/2026 12 PM PDT 1.28 29 0 Normal
08/12/2026 01 PM PDT 1.27 29 - Normal
08/12/2026 02 PM PDT 1.27 29 0 Normal
08/12/2026 03 PM PDT 1.28 29 + Normal
08/12/2026 04 PM PDT 1.28 29 0 Normal
08/12/2026 05 PM PDT 1.29 30 + Normal
08/12/2026 06 PM PDT 1.30 31 + Normal
08/12/2026 07 PM PDT 1.29 30 - Normal
08/12/2026 08 PM PDT 1.28 29 - Normal
08/12/2026 09 PM PDT 1.27 29 - Normal
08/12/2026 10 PM PDT 1.27 29 0 Normal
08/12/2026 11 PM PDT 1.27 29 0 Normal
08/13/2026 12 AM PDT 1.26 28 - Normal
08/13/2026 01 AM PDT 1.26 28 0 Normal
08/13/2026 02 AM PDT 1.26 28 0 Normal
08/13/2026 03 AM PDT 1.26 28 0 Normal
08/13/2026 04 AM PDT 1.26 28 0 Normal
08/13/2026 05 AM PDT 1.26 28 0 Normal
08/13/2026 06 AM PDT 1.26 28 0 Normal
08/13/2026 07 AM PDT 1.26 28 0 Normal
08/13/2026 08 AM PDT 1.26 28 0 Normal
08/13/2026 09 AM PDT 1.26 28 0 Normal
08/13/2026 10 AM PDT 1.25 28 - Normal
08/13/2026 11 AM PDT 1.25 28 0 Normal
08/13/2026 12 PM PDT 1.25 28 0 Normal
08/13/2026 01 PM PDT 1.25 28 0 Normal
08/13/2026 02 PM PDT 1.25 28 0 Normal
08/13/2026 03 PM PDT 1.25 28 0 Normal
08/13/2026 04 PM PDT 1.25 28 0 Normal
08/13/2026 05 PM PDT 1.24 27 - Normal
08/13/2026 06 PM PDT 1.25 28 + Normal
08/13/2026 07 PM PDT 1.24 27 - Normal
08/13/2026 08 PM PDT 1.24 27 0 Normal
08/13/2026 09 PM PDT 1.24 27 0 Normal
08/13/2026 10 PM PDT 1.24 27 0 Normal
08/13/2026 11 PM PDT 1.24 27 0 Normal
08/14/2026 12 AM PDT 1.24 27 0 Normal
08/14/2026 01 AM PDT 1.24 27 0 Normal
08/14/2026 02 AM PDT 1.24 27 0 Normal
08/14/2026 03 AM PDT 1.24 27 0 Normal
08/14/2026 04 AM PDT 1.24 27 0 Normal
08/14/2026 05 AM PDT 1.24 27 0 Normal
08/14/2026 06 AM PDT 1.24 27 0 Normal
08/14/2026 07 AM PDT 1.24 27 0 Normal
08/14/2026 08 AM PDT 1.24 27 0 Normal
08/14/2026 09 AM PDT 1.25 28 + Normal
08/14/2026 10 AM PDT 1.26 28 + Normal
08/14/2026 11 AM PDT 1.28 29 + Normal
08/14/2026 12 PM PDT 1.29 30 + Normal
08/14/2026 01 PM PDT 1.30 31 + Normal
08/14/2026 02 PM PDT 1.31 31 + Normal
08/14/2026 03 PM PDT 1.32 32 + Normal
08/14/2026 04 PM PDT 1.32 32 0 Normal
08/14/2026 05 PM PDT 1.33 32 + Normal
08/14/2026 06 PM PDT 1.34 33 + Normal
08/14/2026 07 PM PDT 1.35 34 + Normal
08/14/2026 08 PM PDT 1.35 34 0 Normal
08/14/2026 09 PM PDT 1.36 34 + Normal
08/14/2026 10 PM PDT 1.37 35 + Normal
08/14/2026 11 PM PDT 1.38 36 + Normal
08/15/2026 12 AM PDT 1.38 36 0 Normal
08/15/2026 01 AM PDT 1.38 36 0 Normal
08/15/2026 02 AM PDT 1.39 37 + Normal
08/15/2026 03 AM PDT 1.39 37 0 Normal
08/15/2026 04 AM PDT 1.39 37 0 Normal
08/15/2026 05 AM PDT 1.39 37 0 Normal
08/15/2026 06 AM PDT 1.40 37 + Normal
08/15/2026 07 AM PDT 1.40 37 0 Normal
08/15/2026 08 AM PDT 1.40 37 0 Normal
08/15/2026 09 AM PDT 1.41 38 + Normal
08/15/2026 10 AM PDT 1.41 38 0 Normal
08/15/2026 11 AM PDT 1.40 37 - Normal
08/15/2026 12 PM PDT 1.41 38 + Normal
08/15/2026 01 PM PDT 1.40 37 - Normal
08/15/2026 02 PM PDT 1.40 37 0 Normal
08/15/2026 03 PM PDT 1.41 38 + Normal
08/15/2026 04 PM PDT 1.40 37 - Normal
08/15/2026 05 PM PDT 1.40 37 0 Normal
08/15/2026 06 PM PDT 1.40 37 0 Normal
08/15/2026 07 PM PDT 1.40 37 0 Normal
08/15/2026 08 PM PDT 1.39 37 - Normal
08/15/2026 09 PM PDT 1.40 37 + Normal
08/15/2026 10 PM PDT 1.40 37 0 Normal
08/15/2026 11 PM PDT 1.39 37 - Normal
08/16/2026 12 AM PDT 1.39 37 0 Normal
08/16/2026 01 AM PDT 1.39 37 0 Normal
08/16/2026 02 AM PDT 1.39 37 0 Normal
08/16/2026 03 AM PDT 1.39 37 0 Normal
08/16/2026 04 AM PDT 1.38 36 - Normal
08/16/2026 05 AM PDT 1.38 36 0 Normal
08/16/2026 06 AM PDT 1.38 36 0 Normal
08/16/2026 07 AM PDT 1.38 36 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
08/16/2026 08 AM PDT 1.38 36 Normal
08/16/2026 09 AM PDT 1.38 36 0 Normal
08/16/2026 10 AM PDT 1.38 36 0 Normal
08/16/2026 11 AM PDT 1.38 36 0 Normal
08/16/2026 12 PM PDT 1.38 36 0 Normal
08/16/2026 01 PM PDT 1.38 36 0 Normal
08/16/2026 02 PM PDT 1.38 36 0 Normal
08/16/2026 03 PM PDT 1.37 35 - Normal
08/16/2026 04 PM PDT 1.37 35 0 Normal
08/16/2026 05 PM PDT 1.37 35 0 Normal
08/16/2026 06 PM PDT 1.37 35 0 Normal
08/16/2026 07 PM PDT 1.37 35 0 Normal
08/16/2026 08 PM PDT 1.37 35 0 Normal
08/16/2026 09 PM PDT 1.37 35 0 Normal
08/16/2026 10 PM PDT 1.37 35 0 Normal
08/16/2026 11 PM PDT 1.37 35 0 Normal
08/17/2026 12 AM PDT 1.37 35 0 Normal
08/17/2026 01 AM PDT 1.37 35 0 Normal
08/17/2026 02 AM PDT 1.37 35 0 Normal
08/17/2026 03 AM PDT 1.37 35 0 Normal
08/17/2026 04 AM PDT 1.37 35 0 Normal
08/17/2026 05 AM PDT 1.37 35 0 Normal
08/17/2026 06 AM PDT 1.36 34 - Normal
08/17/2026 07 AM PDT 1.36 34 0 Normal
08/17/2026 08 AM PDT 1.36 34 0 Normal
08/17/2026 09 AM PDT 1.36 34 0 Normal
08/17/2026 10 AM PDT 1.36 34 0 Normal
08/17/2026 11 AM PDT 1.36 34 0 Normal
08/17/2026 12 PM PDT 1.36 34 0 Normal
08/17/2026 01 PM PDT 1.36 34 0 Normal
08/17/2026 02 PM PDT 1.36 34 0 Normal
08/17/2026 03 PM PDT 1.36 34 0 Normal
08/17/2026 04 PM PDT 1.36 34 0 Normal
08/17/2026 05 PM PDT 1.36 34 0 Normal
08/17/2026 06 PM PDT 1.36 34 0 Normal
08/17/2026 07 PM PDT 1.36 34 0 Normal
08/17/2026 08 PM PDT 1.36 34 0 Normal
08/17/2026 09 PM PDT 1.36 34 0 Normal
08/17/2026 10 PM PDT 1.36 34 0 Normal
08/17/2026 11 PM PDT 1.35 34 - Normal
08/18/2026 12 AM PDT 1.35 34 0 Normal
08/18/2026 01 AM PDT 1.35 34 0 Normal
08/18/2026 02 AM PDT 1.35 34 0 Normal
08/18/2026 03 AM PDT 1.35 34 0 Normal
08/18/2026 04 AM PDT 1.35 34 0 Normal
08/18/2026 05 AM PDT 1.35 34 0 Normal
08/18/2026 06 AM PDT 1.35 34 0 Normal
08/18/2026 07 AM PDT 1.35 34 0 Normal
08/18/2026 08 AM PDT 1.35 34 0 Normal
08/18/2026 09 AM PDT 1.35 34 0 Normal
08/18/2026 10 AM PDT 1.35 34 0 Normal
08/18/2026 11 AM PDT 1.35 34 0 Normal
08/18/2026 12 PM PDT 1.35 34 0 Normal
08/18/2026 01 PM PDT 1.35 34 0 Normal
08/18/2026 02 PM PDT 1.35 34 0 Normal
08/18/2026 03 PM PDT 1.35 34 0 Normal
08/18/2026 04 PM PDT 1.35 34 0 Normal
08/18/2026 05 PM PDT 1.34 33 - Normal
08/18/2026 06 PM PDT 1.34 33 0 Normal
08/18/2026 07 PM PDT 1.34 33 0 Normal
08/18/2026 08 PM PDT 1.34 33 0 Normal
08/18/2026 09 PM PDT 1.34 33 0 Normal
08/18/2026 10 PM PDT 1.34 33 0 Normal
08/18/2026 11 PM PDT 1.34 33 0 Normal
08/19/2026 12 AM PDT 1.34 33 0 Normal
08/19/2026 01 AM PDT 1.34 33 0 Normal
08/19/2026 02 AM PDT 1.34 33 0 Normal
08/19/2026 03 AM PDT 1.34 33 0 Normal
08/19/2026 04 AM PDT 1.34 33 0 Normal
08/19/2026 05 AM PDT 1.34 33 0 Normal
08/19/2026 06 AM PDT 1.34 33 0 Normal
08/19/2026 07 AM PDT 1.34 33 0 Normal
08/19/2026 08 AM PDT 1.34 33 0 Normal
08/19/2026 09 AM PDT 1.34 33 0 Normal
08/19/2026 10 AM PDT 1.34 33 0 Normal
08/19/2026 11 AM PDT 1.33 32 - Normal
08/19/2026 12 PM PDT 1.33 32 0 Normal
08/19/2026 01 PM PDT 1.33 32 0 Normal
08/19/2026 02 PM PDT 1.33 32 0 Normal
08/19/2026 03 PM PDT 1.33 32 0 Normal
08/19/2026 04 PM PDT 1.33 32 0 Normal
08/19/2026 05 PM PDT 1.33 32 0 Normal
08/19/2026 06 PM PDT 1.33 32 0 Normal
08/19/2026 07 PM PDT 1.33 32 0 Normal
08/19/2026 08 PM PDT 1.33 32 0 Normal
08/19/2026 09 PM PDT 1.33 32 0 Normal
08/19/2026 10 PM PDT 1.33 32 0 Normal
08/19/2026 11 PM PDT 1.33 32 0 Normal
08/20/2026 12 AM PDT 1.33 32 0 Normal
08/20/2026 01 AM PDT 1.33 32 0 Normal
08/20/2026 02 AM PDT 1.33 32 0 Normal
08/20/2026 03 AM PDT 1.33 32 0 Normal
08/20/2026 04 AM PDT 1.32 32 - Normal
08/20/2026 05 AM PDT 1.32 32 0 Normal
08/20/2026 06 AM PDT 1.32 32 0 Normal
08/20/2026 07 AM PDT 1.32 32 0 Normal
08/20/2026 08 AM PDT 1.32 32 0 Normal
08/20/2026 09 AM PDT 1.32 32 0 Normal
08/20/2026 10 AM PDT 1.32 32 0 Normal
08/20/2026 11 AM PDT 1.32 32 0 Normal
08/20/2026 12 PM PDT 1.32 32 0 Normal
08/20/2026 01 PM PDT 1.32 32 0 Normal
08/20/2026 02 PM PDT 1.32 32 0 Normal
08/20/2026 03 PM PDT 1.32 32 0 Normal
08/20/2026 04 PM PDT 1.32 32 0 Normal
08/20/2026 05 PM PDT 1.32 32 0 Normal
08/20/2026 06 PM PDT 1.32 32 0 Normal
08/20/2026 07 PM PDT 1.32 32 0 Normal
08/20/2026 08 PM PDT 1.32 32 0 Normal
08/20/2026 09 PM PDT 1.31 31 - Normal
08/20/2026 10 PM PDT 1.31 31 0 Normal
08/20/2026 11 PM PDT 1.31 31 0 Normal
08/21/2026 12 AM PDT 1.31 31 0 Normal
08/21/2026 01 AM PDT 1.31 31 0 Normal
08/21/2026 02 AM PDT 1.31 31 0 Normal
08/21/2026 03 AM PDT 1.31 31 0 Normal
08/21/2026 04 AM PDT 1.31 31 0 Normal
08/21/2026 05 AM PDT 1.31 31 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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