Lookout Point and Roslyn Fire Station crew told Fulton Hogan management when they arrived that they could do little to help salvage the truck.
Fulton Hogan Dunedin manager Richard Fulton said he was glad no-one had been injured in the incident.
Bath St resident Jocelyn McIver said she was talking on the phone to her daughter, when she looked out the window and saw a "big blue truck banging up the road" across the creek from her home.
"Then I heard an almighty bang and said to my daughter, there's a truck in the river."
While on the phone to emergency services, she saw the driver sitting beside the truck and then climb up the bank and walk up the road.
Mrs McIver said she walked on McIntosh Rd last week and talked with her husband Graeme McIver about the narrowness of the road and how it was a wonder somebody had not slid down the bank.
The truck was left in place for the night, she said.
In 2011, two Delta contractors escaped injury when their truck fell down a bank on McIntosh during a weed-spraying operation.