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How full are the Boise River reservoirs? We've got some numbers

The Bureau of Reclamation often refers to reservoirs like the Anderson Ranch Dam Reservoir as tea cups.

The idea is when one cup gets too full, water is poured into another cup, making room for storage. There are three reservoirs: the Anderson Ranch Dam, Arrowrock Dam, and Lucky Peak Dam.

The concern is all the snow from this winter will come off the mountains and gush into the Boise River systems at once, overwhelming the tea cups.

The reservoir at Anderson Ranch Dam in Elmore County is the biggest teacup in the three reservoirs that make up the Boise River system.

That dam was completed in 1950.

As of Tuesday, the Bureau of Reclamation reported the reservoir 59 percent full. It's total storage capacity is some 134 billion gallons of water.

Down river from Anderson Ranch, is Arrowrock Dam, the oldest in the Boise River system. It opened in 1915.

Arrowrock Reservoir was 55 percent full as of Tuesday and it can hold around 88 billion gallons.

Lucky Peak is the youngest dam in the system, opening in 1955.

On Tuesday, the Bureau of Reclamation reported Lucky Peak Reservoir was 34 percent full.

Lucky Peak can hold about the same amount of water as Arrowrock, around 88 billion gallons.

The Boise Basin snow pack is measured at 140 percent of average March 1. The reservoir levels are high with four months until the big spring run-off hits the areas.

As more water is released from the system to make room for the big spring run off, the whole reservoir system will require careful monitoring and management, because given a couple more very warm days, it could all fill up too quickly.

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