He said: "People who do this kind of thing are ignorant, selfish and have a complete lack of responsibility. It just makes me so angry.
Mr Ward believes the offence may have been committed by bogus waste collectors, who undercut reputable firms then dump rubbish at roadsides rather than pay for it to be properly disposed of.
"These people have no regard for others and are just out to make a quick buck. People should steer clear of them," he said.
Around 100 old tyres were discovered in the car park at the top of Nike Air Max Black Tavas Wyming Brook nature reserve, off Redmires Road, Lodge Moor.
Mr Ward has reported the matter to police but is pessimistic about the outcome because fly tippers are notoriously hard to catch.
Sheffield Wildlife Trust looks after nine sites around the city and regularly has to deal with fly tipping.
Trust charity in clear up costs.
How could someone do such a thing? Not so long ago, little fish were put in the water to encourage trout to swim upstream and it makes you wonder what might happen to them with the pollution."
"This was of particular concern because the tyres contain nasty chemicals which would leach into the water."
Walker Howard Whittles, who regularly takes a stroll through the reserve a woodland oasis where a brook flows downhill into the Rivelin Valley via a network of pools and waterfalls reported the incident to the trust.
"It spoils things for people who come to places like Wyming Brook to enjoy themselves."
The worst problems are at Carbrook Ravine in Woodthorpe, accounting for half of the 10 days the trust's workers spent clearing illegally dumped rubbish in 2008/9.
a dent in our budget each year. The problem is taking away a lot of time and a lot of money."
John Paul Ward, nature reserve manage for Sheffield Wildlife Trust, said: "There were about 100 tyres on the car park, and a few had gone down the slope into the brook itself.
Beauty spot tyre clean
FLY tippers were today condemned as "ignorant and selfish" after dumping tyres at a rural beauty spot costing the Sheffield Wildlife Air Max For Kids Girls 2015
Mr Ward said: "It's quite Nike Air Max 2015 White
The clear up was more than a day's work, costing between 800 and 900.
He said: "I was disgusted. It's a beautiful environment. Nike Air Max Thea Joli
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