New Exchequer-lk Mcclure Reservoir
New Exchequer-Lk Mcclure
Exchequer Reservoir, also known as New Exchequer, is a reservoir located in California's Mariposa County. It was built in 1967 to provide water for hydroelectric power generation and irrigation for agricultural purposes. The reservoir is fed by the Merced River and several smaller streams, and its water is used by the Merced Irrigation District. The area surrounding the reservoir is popular for fishing, boating, and camping, and there are several campgrounds and recreational facilities nearby. The reservoir's water supply is heavily reliant on snowpack in the surrounding Sierra Nevada mountains, and the Merced Irrigation District closely monitors the snowpack levels each winter to ensure there is enough water for the upcoming year.
Inside the reservoir
The real shoreline of this water body, with a depth model scaled so the basin holds exactly its recorded storage. Drag to orbit, scroll to zoom, and use the slider to drain and refill it. Click anywhere on the basin for the modelled depth there.
How this is built. The shoreline is the National Hydrography
Dataset polygon for this water body,
matched to the dam by proximity and confirmed by comparing its area with the
National Inventory of Dams surface area.
Depth is modelled, not surveyed: the basin is shaped by distance from
shore — deep in open water, shallow in the bays — and scaled so its
volume equals the recorded storage. No national bathymetric survey exists for
US reservoirs. Treat the shoreline, area and volume as measured, and the depth
distribution as an informed approximation.
Above normal pool, water is shown rising within the normal-pool
shoreline. Where it would actually spread depends on the surrounding
terrain, which is not modelled here — a reservoir in a steep canyon barely
widens, one on flat ground can spread a long way. This is a depth and volume
figure, not an inundation map. Official inundation mapping for a dam
comes from its Emergency Action Plan.
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 New Exchequer-Lk Mcclure -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Turlock Cn Nr La Grange Ca | 562 cfs | → |
| Tuolumne R Bl Lagrange Dam Nr Lagrange Ca | 179 cfs | → |
| Modesto Cn Nr La Grange Ca | 666 cfs | → |
| Big C Ab Whites Gulch Nr Groveland Ca | · | → |
| Tuolumne R Bl Early Intake Nr Mather Ca | 64 cfs | → |
| Cherry C Bl Dion R Holm Ph | 28 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near New Exchequer-Lk Mcclure.
Boat launches
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Campgrounds
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Fishing spots
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River runs
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About New Exchequer-Lk Mcclure
Where does the data for New Exchequer-lk Mcclure 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.
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