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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: | Oct 18 2026 at 7:17 AM PDT | Next Issuance: | Oct 19 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: 10/18/2026 at 07:17 AM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 10/15/2026 at 06:00 AM PDT
# Maximum Observed Stage: 0.60 Feet
# Maximum Observed Flow: 4 cfs
#
# Earliest Date & Time of Maximum Forecast: 10/23/2026 at 04:00 AM PDT
# Maximum Forecast Stage: 1.13 Feet
# Maximum Forecast Flow: 21 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
10/13/2026 07 AM PDT 0.59 4 Normal
10/13/2026 08 AM PDT 0.59 4 0 Normal
10/13/2026 09 AM PDT 0.59 4 0 Normal
10/13/2026 10 AM PDT 0.59 4 0 Normal
10/13/2026 11 AM PDT 0.59 4 0 Normal
10/13/2026 12 PM PDT 0.59 4 0 Normal
10/13/2026 01 PM PDT 0.59 4 0 Normal
10/13/2026 02 PM PDT 0.59 4 0 Normal
10/13/2026 03 PM PDT 0.59 4 0 Normal
10/13/2026 04 PM PDT 0.59 4 0 Normal
10/13/2026 05 PM PDT 0.59 4 0 Normal
10/13/2026 06 PM PDT 0.59 4 0 Normal
10/13/2026 07 PM PDT 0.59 4 0 Normal
10/13/2026 08 PM PDT 0.59 4 0 Normal
10/13/2026 09 PM PDT 0.60 4 + Normal
10/13/2026 10 PM PDT 0.60 4 0 Normal
10/13/2026 11 PM PDT 0.60 4 0 Normal
10/14/2026 12 AM PDT 0.60 4 0 Normal
10/14/2026 01 AM PDT 0.59 4 - Normal
10/14/2026 02 AM PDT 0.60 4 + Normal
10/14/2026 03 AM PDT 0.59 4 - Normal
10/14/2026 04 AM PDT 0.59 4 0 Normal
10/14/2026 05 AM PDT 0.59 4 0 Normal
10/14/2026 06 AM PDT 0.60 4 + Normal
10/14/2026 07 AM PDT 0.59 4 - Normal
10/14/2026 08 AM PDT 0.59 4 0 Normal
10/14/2026 09 AM PDT 0.59 4 0 Normal
10/14/2026 10 AM PDT 0.59 4 0 Normal
10/14/2026 11 AM PDT 0.59 4 0 Normal
10/14/2026 12 PM PDT 0.59 4 0 Normal
10/14/2026 01 PM PDT 0.59 4 0 Normal
10/14/2026 02 PM PDT 0.59 4 0 Normal
10/14/2026 03 PM PDT 0.59 4 0 Normal
10/14/2026 04 PM PDT 0.59 4 0 Normal
10/14/2026 05 PM PDT 0.59 4 0 Normal
10/14/2026 06 PM PDT 0.59 4 0 Normal
10/14/2026 07 PM PDT 0.59 4 0 Normal
10/14/2026 08 PM PDT 0.59 4 0 Normal
10/14/2026 09 PM PDT 0.59 4 0 Normal
10/14/2026 10 PM PDT 0.59 4 0 Normal
10/14/2026 11 PM PDT 0.59 4 0 Normal
10/15/2026 12 AM PDT 0.59 4 0 Normal
10/15/2026 01 AM PDT 0.59 4 0 Normal
10/15/2026 02 AM PDT 0.59 4 0 Normal
10/15/2026 03 AM PDT 0.59 4 0 Normal
10/15/2026 04 AM PDT 0.60 4 + Normal
10/15/2026 05 AM PDT 0.60 4 0 Normal
10/15/2026 06 AM PDT 0.60 4 0 Normal
10/15/2026 07 AM PDT 0.59 4 - Normal
10/15/2026 08 AM PDT 0.58 4 - Normal
10/15/2026 09 AM PDT 0.58 4 0 Normal
10/15/2026 10 AM PDT 0.58 4 0 Normal
10/15/2026 11 AM PDT 0.58 4 0 Normal
10/15/2026 12 PM PDT 0.58 4 0 Normal
10/15/2026 01 PM PDT 0.58 4 0 Normal
10/15/2026 02 PM PDT 0.58 4 0 Normal
10/15/2026 03 PM PDT 0.58 4 0 Normal
10/15/2026 04 PM PDT 0.58 4 0 Normal
10/15/2026 05 PM PDT 0.58 4 0 Normal
10/15/2026 06 PM PDT 0.58 4 0 Normal
10/15/2026 07 PM PDT 0.58 4 0 Normal
10/15/2026 08 PM PDT 0.58 4 0 Normal
10/15/2026 09 PM PDT 0.58 4 0 Normal
10/15/2026 10 PM PDT 0.58 4 0 Normal
10/15/2026 11 PM PDT 0.58 4 0 Normal
10/16/2026 12 AM PDT 0.58 4 0 Normal
10/16/2026 01 AM PDT 0.58 4 0 Normal
10/16/2026 02 AM PDT 0.57 4 - Normal
10/16/2026 03 AM PDT 0.58 4 + Normal
10/16/2026 04 AM PDT 0.58 4 0 Normal
10/16/2026 05 AM PDT 0.58 4 0 Normal
10/16/2026 06 AM PDT 0.57 4 - Normal
10/16/2026 07 AM PDT 0.58 4 + Normal
10/16/2026 08 AM PDT 0.57 4 - Normal
10/16/2026 09 AM PDT 0.57 4 0 Normal
10/16/2026 10 AM PDT 0.57 4 0 Normal
10/16/2026 11 AM PDT 0.58 4 + Normal
10/16/2026 12 PM PDT 0.57 4 - Normal
10/16/2026 01 PM PDT 0.57 4 0 Normal
10/16/2026 02 PM PDT 0.58 4 + Normal
10/16/2026 03 PM PDT 0.57 4 - Normal
10/16/2026 04 PM PDT 0.57 4 0 Normal
10/16/2026 05 PM PDT 0.57 4 0 Normal
10/16/2026 06 PM PDT 0.57 4 0 Normal
10/16/2026 07 PM PDT 0.57 4 0 Normal
10/16/2026 08 PM PDT 0.57 4 0 Normal
10/16/2026 09 PM PDT 0.57 4 0 Normal
10/16/2026 10 PM PDT 0.57 4 0 Normal
10/16/2026 11 PM PDT 0.57 4 0 Normal
10/17/2026 12 AM PDT 0.57 4 0 Normal
10/17/2026 01 AM PDT 0.57 4 0 Normal
10/17/2026 02 AM PDT 0.57 4 0 Normal
10/17/2026 03 AM PDT 0.57 4 0 Normal
10/17/2026 04 AM PDT 0.57 4 0 Normal
10/17/2026 05 AM PDT 0.57 4 0 Normal
10/17/2026 06 AM PDT 0.57 4 0 Normal
10/17/2026 07 AM PDT 0.57 4 0 Normal
10/17/2026 08 AM PDT 0.57 4 0 Normal
10/17/2026 09 AM PDT 0.57 4 0 Normal
10/17/2026 10 AM PDT 0.57 4 0 Normal
10/17/2026 11 AM PDT 0.57 4 0 Normal
10/17/2026 12 PM PDT 0.57 4 0 Normal
10/17/2026 01 PM PDT 0.57 4 0 Normal
10/17/2026 02 PM PDT 0.57 4 0 Normal
10/17/2026 03 PM PDT 0.57 4 0 Normal
10/17/2026 04 PM PDT 0.57 4 0 Normal
10/17/2026 05 PM PDT 0.57 4 0 Normal
10/17/2026 06 PM PDT 0.57 4 0 Normal
10/17/2026 07 PM PDT 0.57 4 0 Normal
10/17/2026 08 PM PDT 0.57 4 0 Normal
10/17/2026 09 PM PDT 0.57 4 0 Normal
10/17/2026 10 PM PDT 0.57 4 0 Normal
10/17/2026 11 PM PDT 0.57 4 0 Normal
10/18/2026 12 AM PDT 0.57 4 0 Normal
10/18/2026 01 AM PDT 0.57 4 0 Normal
10/18/2026 02 AM PDT 0.57 4 0 Normal
10/18/2026 03 AM PDT 0.57 4 0 Normal
10/18/2026 04 AM PDT 0.57 4 0 Normal
10/18/2026 05 AM PDT 0.57 4 0 Normal
10/18/2026 06 AM PDT 0.57 4 0 Normal
10/18/2026 07 AM PDT 0.57 4 0 Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
10/18/2026 08 AM PDT 0.57 4 Normal
10/18/2026 09 AM PDT 0.57 4 0 Normal
10/18/2026 10 AM PDT 0.57 4 0 Normal
10/18/2026 11 AM PDT 0.58 4 + Normal
10/18/2026 12 PM PDT 0.58 4 0 Normal
10/18/2026 01 PM PDT 0.58 4 0 Normal
10/18/2026 02 PM PDT 0.58 4 0 Normal
10/18/2026 03 PM PDT 0.58 4 0 Normal
10/18/2026 04 PM PDT 0.58 4 0 Normal
10/18/2026 05 PM PDT 0.58 4 0 Normal
10/18/2026 06 PM PDT 0.58 4 0 Normal
10/18/2026 07 PM PDT 0.58 4 0 Normal
10/18/2026 08 PM PDT 0.58 4 0 Normal
10/18/2026 09 PM PDT 0.58 4 0 Normal
10/18/2026 10 PM PDT 0.58 4 0 Normal
10/18/2026 11 PM PDT 0.58 4 0 Normal
10/19/2026 12 AM PDT 0.58 4 0 Normal
10/19/2026 01 AM PDT 0.58 4 0 Normal
10/19/2026 02 AM PDT 0.58 4 0 Normal
10/19/2026 03 AM PDT 0.58 4 0 Normal
10/19/2026 04 AM PDT 0.58 4 0 Normal
10/19/2026 05 AM PDT 0.58 4 0 Normal
10/19/2026 06 AM PDT 0.58 4 0 Normal
10/19/2026 07 AM PDT 0.58 4 0 Normal
10/19/2026 08 AM PDT 0.58 4 0 Normal
10/19/2026 09 AM PDT 0.58 4 0 Normal
10/19/2026 10 AM PDT 0.58 4 0 Normal
10/19/2026 11 AM PDT 0.59 4 + Normal
10/19/2026 12 PM PDT 0.59 4 0 Normal
10/19/2026 01 PM PDT 0.59 4 0 Normal
10/19/2026 02 PM PDT 0.59 4 0 Normal
10/19/2026 03 PM PDT 0.59 4 0 Normal
10/19/2026 04 PM PDT 0.59 4 0 Normal
10/19/2026 05 PM PDT 0.59 4 0 Normal
10/19/2026 06 PM PDT 0.59 4 0 Normal
10/19/2026 07 PM PDT 0.59 4 0 Normal
10/19/2026 08 PM PDT 0.59 4 0 Normal
10/19/2026 09 PM PDT 0.59 4 0 Normal
10/19/2026 10 PM PDT 0.59 4 0 Normal
10/19/2026 11 PM PDT 0.59 4 0 Normal
10/20/2026 12 AM PDT 0.59 4 0 Normal
10/20/2026 01 AM PDT 0.59 4 0 Normal
10/20/2026 02 AM PDT 0.59 4 0 Normal
10/20/2026 03 AM PDT 0.59 4 0 Normal
10/20/2026 04 AM PDT 0.59 4 0 Normal
10/20/2026 05 AM PDT 0.59 4 0 Normal
10/20/2026 06 AM PDT 0.59 4 0 Normal
10/20/2026 07 AM PDT 0.59 4 0 Normal
10/20/2026 08 AM PDT 0.59 4 0 Normal
10/20/2026 09 AM PDT 0.59 4 0 Normal
10/20/2026 10 AM PDT 0.60 4 + Normal
10/20/2026 11 AM PDT 0.60 4 0 Normal
10/20/2026 12 PM PDT 0.60 4 0 Normal
10/20/2026 01 PM PDT 0.60 4 0 Normal
10/20/2026 02 PM PDT 0.60 4 0 Normal
10/20/2026 03 PM PDT 0.60 4 0 Normal
10/20/2026 04 PM PDT 0.60 4 0 Normal
10/20/2026 05 PM PDT 0.60 4 0 Normal
10/20/2026 06 PM PDT 0.60 4 0 Normal
10/20/2026 07 PM PDT 0.60 4 0 Normal
10/20/2026 08 PM PDT 0.60 4 0 Normal
10/20/2026 09 PM PDT 0.60 4 0 Normal
10/20/2026 10 PM PDT 0.60 4 0 Normal
10/20/2026 11 PM PDT 0.60 4 0 Normal
10/21/2026 12 AM PDT 0.60 4 0 Normal
10/21/2026 01 AM PDT 0.60 4 0 Normal
10/21/2026 02 AM PDT 0.60 4 0 Normal
10/21/2026 03 AM PDT 0.60 4 0 Normal
10/21/2026 04 AM PDT 0.61 4 + Normal
10/21/2026 05 AM PDT 0.61 4 0 Normal
10/21/2026 06 AM PDT 0.62 4 + Normal
10/21/2026 07 AM PDT 0.64 5 + Normal
10/21/2026 08 AM PDT 0.67 5 + Normal
10/21/2026 09 AM PDT 0.71 6 + Normal
10/21/2026 10 AM PDT 0.75 7 + Normal
10/21/2026 11 AM PDT 0.79 8 + Normal
10/21/2026 12 PM PDT 0.82 9 + Normal
10/21/2026 01 PM PDT 0.85 10 + Normal
10/21/2026 02 PM PDT 0.88 11 + Normal
10/21/2026 03 PM PDT 0.90 12 + Normal
10/21/2026 04 PM PDT 0.92 12 + Normal
10/21/2026 05 PM PDT 0.94 13 + Normal
10/21/2026 06 PM PDT 0.95 13 + Normal
10/21/2026 07 PM PDT 0.96 14 + Normal
10/21/2026 08 PM PDT 0.97 14 + Normal
10/21/2026 09 PM PDT 0.98 14 + Normal
10/21/2026 10 PM PDT 0.99 15 + Normal
10/21/2026 11 PM PDT 1.00 15 + Normal
10/22/2026 12 AM PDT 1.01 16 + Normal
10/22/2026 01 AM PDT 1.01 16 0 Normal
10/22/2026 02 AM PDT 1.02 16 + Normal
10/22/2026 03 AM PDT 1.03 16 + Normal
10/22/2026 04 AM PDT 1.03 16 0 Normal
10/22/2026 05 AM PDT 1.04 17 + Normal
10/22/2026 06 AM PDT 1.04 17 0 Normal
10/22/2026 07 AM PDT 1.05 17 + Normal
10/22/2026 08 AM PDT 1.05 17 0 Normal
10/22/2026 09 AM PDT 1.06 18 + Normal
10/22/2026 10 AM PDT 1.07 18 + Normal
10/22/2026 11 AM PDT 1.07 18 0 Normal
10/22/2026 12 PM PDT 1.08 19 + Normal
10/22/2026 01 PM PDT 1.08 19 0 Normal
10/22/2026 02 PM PDT 1.09 19 + Normal
10/22/2026 03 PM PDT 1.09 19 0 Normal
10/22/2026 04 PM PDT 1.09 19 0 Normal
10/22/2026 05 PM PDT 1.10 20 + Normal
10/22/2026 06 PM PDT 1.10 20 0 Normal
10/22/2026 07 PM PDT 1.10 20 0 Normal
10/22/2026 08 PM PDT 1.11 20 + Normal
10/22/2026 09 PM PDT 1.11 20 0 Normal
10/22/2026 10 PM PDT 1.11 20 0 Normal
10/22/2026 11 PM PDT 1.12 21 + Normal
10/23/2026 12 AM PDT 1.12 21 0 Normal
10/23/2026 01 AM PDT 1.12 21 0 Normal
10/23/2026 02 AM PDT 1.12 21 0 Normal
10/23/2026 03 AM PDT 1.12 21 0 Normal
10/23/2026 04 AM PDT 1.13 21 + Normal
10/23/2026 05 AM PDT 1.13 21 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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