Reservoir Report

Mackay Res Nr Mackay Id reservoir

Idaho, USA USGS
Today high
--
Tonight low
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Current storage
61ft
% of normal
10%
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Right now · current storage
Mackay Res Nr Mackay Id
USGS · 13126000
61 ft
As of 2026-05-16
Seasonal avg
56
Record max
67
24h change
0.2%
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Mackay Res Nr Mackay Id -- None reservoir
Mackay Res Nr Mackay Id None
About this reservoir

Mackay Res Nr Mackay Id

Mackay Reservoir in Idaho was created in 1946 by the construction of Mackay Dam on the Big Lost River. The reservoir has a capacity of 36,200 acre-feet of water and is primarily used for irrigation of agricultural land. The hydrology of the area is influenced by snowpack, which provides water for both the reservoir and the surrounding agricultural land. The reservoir is also used for recreational purposes, including fishing, boating, and camping. The Big Lost River provides water to the reservoir and is a popular destination for fly fishing. The surrounding area is known for its scenic beauty and opportunities for outdoor recreation, including hiking, hunting, and wildlife viewing.

StateNone
OperatorUSGS
Site ID13126000
Percent of normal10%
Last updated2026-05-16
Records since2020
Storage trends

Daily levels at Mackay Res Nr Mackay Id

Storage volume, pool elevation, and total release plotted from the operating agency's daily observations.

Reservoir storage, acre-ft

ac-ft · code 00054

Gage height, ft

ft · code 00065

Detailed forecast

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.

Hourly detail

Next 5 days, hour by hour

Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.

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Deep dive

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.

TimeConditionTemp (°F)Snow (in)Rain (in)Humidity (%)Wind (mps)Wind dir
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Long-term outlook

15-day temperature & precipitation

Daily temperatures, snow, and rain projected over the next two weeks.

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Regional inflow

Nearby streamflow gauges

USGS streamgauges around Mackay Res Nr Mackay Id -- inflows here typically show up in storage 24-72 hours later.

Track Mackay Res Nr Mackay Id in the Snoflo app

Save this reservoir as a favorite and set push alerts when storage crosses a threshold (e.g. "alert me at 80% of normal").

FAQ

About Mackay Res Nr Mackay Id

Where does the data for Mackay Res Nr Mackay Id 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 above 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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Other water bodies near here

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Premium feature

Favorites and alerts are part of Snoflo Premium. Save reservoirs, set storage thresholds, and get push notifications when conditions cross.

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Manage alerts in the Snoflo app

Custom alerts are configured in the iOS app -- favorite this reservoir, set a threshold, and you'll get a push the moment conditions cross.

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