CITY OF NAPA · TIDE
—ft MLLW
Next predicted high tideLoading…
WATERSHED OPERATIONS / NAPA COUNTY
Water conditions, at a glance.
One clear view of the signals shaping the Napa River watershed.
Connecting to public data·Awaiting first response
Measurements and predictions retain source-specific datumsNAPA RIVER NEAR NAPA
—ft gage height
Latest observed stageLoading…
WEATHER ADVISORIES
—active alerts
NWS · Napa vicinityLoading…
NAPA RAINFALL · ONERAIN
—in / 24h
Napa gaugeConnecting…
SPATIAL MONITORING
Watershed station map
Monitoring stations
Map base layer requires an internet connection.
Station selection remains available below.
Station selection remains available below.
SELECTED LOCATION
Napa River, Napa
Tide prediction station · Downtown Napa
Next predicted high
—ft MLLW
Fetching station data…
AUTOMATED INSIGHT
Conditions brief
Connecting to monitoring data. Your conditions brief will appear here when feeds respond.
Rule-based summary for this prototype. Not an AI forecast or flood risk assessment.
ONERAIN MEASUREMENTS / 17805 + NOAA PREDICTIONS / 9415446
Brazos Drawbridge · tide comparison
Compare the OneRain gauge at Brazos Bridge with NOAA’s Brazos Drawbridge tide predictions. Both sources report feet MLLW.
Latest measured level · OneRain—ft MLLW · Brazos Drawbridge
Estimated tide at measurement time—ft MLLW · Brazos Drawbridge
Measured − estimated tide—ft · same MLLW datum
24h average difference—ft · time-weighted signed mean
24h maximum difference—ft · largest sampled absolute deviation
Waiting for OneRain observations…
Retrieving OneRain readings and NOAA tides…
Hover, tap, or use the reading slider to inspect a timestamp.
24-hour statistics compare measurements with estimates at the same timestamps.
Positive differences mean water is above the estimated tide. NOAA provides high/low events for station 9415446; the dashed curve and same-time values use cosine interpolation between those events, not an official continuous prediction. Differences therefore include interpolation error. The 24-hour mean is time-weighted between consecutive measurements; gaps longer than 30 minutes are excluded. Maximum is the largest sampled absolute difference. OneRain data are provisional and unverified.
Datum and location: OneRain site 17805 identifies its water-level reference as MLLW; NOAA station 9415446 predictions also use MLLW. No vertical offset is applied. City of Napa predictions (9415623) remain separate below; this difference is not a correction to Napa predictions.
NAPA RIVER PREDICTIONS ONLY / 30-DAY OUTLOOK
Predicted water level · City of Napa
Selected range · next 3 daysAwaiting feed
Retrieving NOAA tide predictions…
30-day tide overview
Drag across the overview to zoom into any date range.
Loading 30-day predictions…
Start —Drag to zoom · use preset buttons for quick viewsEnd —
Predicted high & low events NOAA station ↗
Select any prediction to zoom around that tide.
NOAA prediction events will appear here.
NOAA high/low predictions · feet MLLWCurve fitted between predicted high/low events; not observed water level or a hydraulic forecast.
NATIONAL WEATHER SERVICE
Weather & advisories
NAPA AREA FORECASTChecking forecast…
Waiting for National Weather Service response.
Alerts will appear here when available.
NWS QUANTITATIVE PRECIPITATION FORECAST / NEXT 24 HOURS
Rainfall forecast · Napa & Mt. Veeder
Two gridded location forecasts, side by side. Amounts are forecast liquid-water equivalent, not measured gauge rainfall.
VALLEY FLOOR
NWS QPFCity of Napa
38.2975° N, 122.2869° W—in / next 24h
Retrieving gridpoint forecast…
NWS Napa forecast ↗WESTERN WATERSHED / RIDGELINE
NWS QPFMt. Veeder
38.3644° N, 122.4210° W—in / next 24h
Retrieving gridpoint forecast…
NWS Mt. Veeder forecast ↗Forecast source: NWS API gridded quantitative precipitation. Six-hour forecast intervals are prorated to a rolling 24-hour window; totals are approximate and may change. NWS forecast estimates are separate from OneRain observed accumulations. Verify forecasts before operational use.
LOCAL GAUGE NETWORK / NAPA ONERAIN
Rainfall & creek monitoring · watershed-wide
Explore public gauge reports by accumulation period, inspect individual stations, and overlay rainfall sites on the watershed map.
OneRain observations are provisional and unverified. Gauges may be stale, flagged, or out of service. Water-level values use station-specific units and reference datums; do not compare them directly or use them as flood thresholds.
RAINFALL ACCUMULATIONS
Reported precipitation
Waiting for report…
SELECTED ONERAIN STATION
Napa
24-hour rainfall
—inches
Last 1 hour—
Last 6 hours—
Last 7 days—
Provisional public observation
View original gauge reportONERAIN WATER LEVELS
Recently reported gauges
Connecting to OneRain level report…
Rainfall figures are reported in inches. Source observation and retrieval times may differ. Station positions are cross-referenced to Napa County's public rain-gauge location layer where available.
TRACEABLE BY DESIGN
Connected public data sources
Every reading links back to its originating agency.