RedactedNarrative: On the above date and time, the operator rented a pontoon boat (V1) from the Holiday Marina for the day. The operator and 8 other family members left Holiday Marina and proceeded down stream under Awalt bridge toward open water of the lake to enjoy the day. The operator stated, between 1400 and 1530 hrs they felt like there was a storm coming, so they headed back to Holiday Marina. A violent rain storm hit the area of the lake where they were located, so much that the operator had to move the boat to the bank because she could not see anything to drive. The storm began to slow down as she was close to Holiday Marina and as she was pulling in, the sun came back out and the storm ceased.  At approximately 1530 - 1600hrs,  the operator headed back out to the main channel of the lake towards Awalt bridge.  As V1 approached Awalt bridge, the operator went to the far right side of Awalt bridge to attempt to go back out to the main channel. As the operator started under Awalt bridge, she underestimated the distance between the upper deck of V1 and the bridge structure above striking Awalt bridge structure and causing severe damage to the upper deck of V1. The operator immediately returned back to Holiday Marina and spoke regarding the damage to V1.  An employee of Holiday Marina called in to TWRA to report the accident. The operator did not realize that the right side of Awalt bridge was lower than any other part of the bridge.