Leeds-born Spurr popped up in first-half stoppage time to volley home David Dunn's corner, which gave Rovers their first league win over Leeds since September 2002, and Bowyer lavished praise on his defender.
"He's been a fantastic signing for a free transfer," he said.
"He's been top drawer. You know exactly what you're going to get and fans love him because of that. His performances have been very, very consistent for us and we're delighted for him. We've encouraged him to score more goals and he always gives us a good celebration when he scores!"
Although the victory was only Blackburn's second in their last seven games, the result means they have conceded just one goal at Ewood Park since the end of August and Bowyer put it down to hard work in training.
He said: "I think it's credit to all the hard work that everybody does on the training field - staff and players. It's something the defenders love doing. They work very hard and it's important you try and keep clean sheets, especially at home.
"We showed some unbelievable character. We matched what Leeds threw at us but still had bravery to play our game and that was important and we played some good stuff today."