That cant be worked out without knowing the depth. However here is a link (below) to work this out.
A pond this size holds up to about 1,955,108 gallons of water.
There are 7.48 gallons of water in cubic foot.
7.48052 Gallons of water in a cubic foot
One cubic foot of water is 7.4805 gallons.
half a pint
1 cubic foot of water is 7.48052 US gallons.
One cubic foot of water is about 7.48 (7.48052) US gallons.
One acre-foot is 325,851.4 US gallons of water.
141.06 gallons
7.48 gallons of water per cubic foot
15228.5 US gallons 12680.4 Imperial gallons when it is filled to 4 and a half feet.
There are 7.481 gallons in one cubic foot.