Goodwin Dam reservoir
Goodwin Dam
Goodwin Dam is located on the Stanislaus River in California and was built in the 1920s for hydroelectric power generation and irrigation purposes. It has a capacity of 44,900 acre-feet of water and spans 690 feet across the river. The dam provides water for agricultural purposes, specifically for almond and walnut orchards, as well as for recreation such as fishing, boating, and camping. The hydrology of the area is dependent on the snowpack in the Sierra Nevada mountains, which provides a significant portion of the surface flow into the river. The dam also helps regulate the river flow and prevent flooding during heavy rains. The Goodwin Dam is an important infrastructure for the region, providing water and power to local communities.
Daily levels at Goodwin Dam
Storage volume, pool elevation, and total release plotted from the operating agency's daily observations.
Storage
acre-ft · code 2
Pool Elevation
ft · code 1
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Goodwin Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Black C Nr Copperopolis Ca | · | → |
| Modesto Cn Nr La Grange Ca | 493 cfs | → |
| Tuolumne R Bl Lagrange Dam Nr Lagrange Ca | 102 cfs | → |
| Turlock Cn Nr La Grange Ca | 1,360 cfs | → |
| Big C Ab Whites Gulch Nr Groveland Ca | 0 cfs | → |
| Tuolumne R A Modesto Ca | 81 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Goodwin Dam.
Boat launches
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Campgrounds
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Fishing spots
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River runs
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About Goodwin Dam
Where does the data for Goodwin Dam come from?
Daily storage, pool elevation, and release rates are sourced from USGS, USBR, and USACE monitoring stations. Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
Storage observations are updated daily by the operating agency. The 15-day weather forecast refreshes throughout the day. Snoflo caches and renders the most recent observation -- check the "as of" timestamp on the storage card.
What does the Hazard hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card below for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this reservoir, set a threshold, and you'll get a push the moment conditions cross.