Paul Thompson and Derwent Lift Services Ltd deny charges of breaching health and safety regulations.
Derwent was judged as satisfactory and Osbaldwick was considered to be a "good school with outstanding outcomes".
Derwent Lift Services Ltd was cleared of three counts, but found guilty of one risk assessment breach.
Derwent Lift Services was cleared of charges under the Health and Safety at Work Act in December.
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Lowther, of Derwent Avenue, Baildon, Bradford, voluntarily gave a swab when officers called at his home in February this year.
Two flood warnings and six flood alerts are in place for Rivers Nidd, Ure, Ouse, Foss and Derwent.
Paul Thompson and his employer Derwent Lift Services Ltd deny health and safety charges at Newcastle Crown Court.
The Labour-run City of York Council is proposing to close Derwent School in September and expand nearby Osbaldwick Primary.
Supt Payne added the River Derwent was not expected to reach the same heights as it did in November.
Pc Bill Barker, 44, fell into the River Derwent when the A597 bridge was destroyed by floods in Workington.
The Derwent school buildings would be retained with Osbaldwick running from both sites.
Speaking after the verdict, Derwent Lift Services said in a statement that it was "saddened" by Mrs Young's death.
The River Derwent has peaked through Malton but water levels would remain high for some time, the agency said.
Mr Thompson said the current level of the Derwent was 16ft (4.9m) and well below the height of the defences.
Derwent Holdings, challenged the original planning permission after Trafford Council rejected Derwent's application for a Sainsbury's store at White City.
It will be Saturday before the level of the River Derwent at Malton starts to drop, the Environment Agency has said.
Property company Derwent Holdings, owners of nearby White City retail park, wants a judicial review of planning permission given to the club.
In the U.K. that method has led Corl to embrace Derwent London, a developer of office buildings in the city's swanky West End.
The Hawtin brothers run the Derwent Absolute Return Fund Ltd which bases its trading activity on sentiment it gathers from tweets around the world.
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However, Derwent has argued the council gave permission close by for a Tesco's store, a development which is allied to the Lancashire CCC plans.
The preferred option is to raise sections of the flood walls and embankments along the rivers Cocker and Derwent in the centre of the town.
The cost per pupil per year at Derwent is almost double that of neighbouring schools due to the low number of children attending, she said.
Derwent, Lower Derwent from Elvington to Barmby, and Malton and Norton.
Light winds and the traditional difficult run to the finish on the Derwent River left the outcome in doubt to the very end, even before the protest.
Jim Buchanan, the leader of Cumbria County Council, said the new footbridge bridge, which will span the River Derwent, would be an important boost for the community.
The town's A597 Northside Bridge and a footbridge collapsed, while the Calva Bridge was left unstable, when the River Derwent flooded in the early hours of 20 November.
The firms and Mr Hudson, 63, of Main Street, Sutton-on-Derwent, were each found guilty of two charges of causing statutory noise nuisance in breach of a noise abatement order.
Mr Thompson, of Denton Burn, Newcastle, and Derwent Lift Services Ltd based in Stanley, County Durham, are accused of charges under the Health and Safety at Work Act 1974.
Derwent Holdings is one of several companies set up by the millionaire Kwik Save founder Albert Gubay, whose will states that all of its profits will fund charitable projects.
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