The work is expected to start in the spring and last for around 12 months.
The project will see the construction of almost half a kilometre of new road, including a new viaduct running parallel to the shoreline.
The road will also be widened to allow vehicles to pass more easily.
Transport Minister, Keith Brown said: "The A82 Pulpit Rock scheme sits within one of the most unique and scenic landscapes in Scotland that brings many visitors to Loch Lomond. We fully recognise delivery will not be without its engineering challenges.
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"Our commitment to improve the traffic flow at Pulpit Rock is unwavering and, on completion, this project will bring real benefits for businesses and communities in the Highlands and Islands, not least the haulage industry. This is why I am pleased the announcement our preferred contractor shows, at long last, Pulpit Rock will have a road befitting its setting and importance.
"Throughout the procurement process emphasis has been placed on minimising the impact on communities and businesses. I have tasked Transport Scotland to ensure this continues to remain a key focus throughout construction."
The construction of the new viaduct and the cutting of the rock on the landward side of the road will require the A82 to be closed in each direction for period of up to 14 weeks between 1 October 2013 and 6 January 2014.
A statement from Transport Scotland said: "Suitable advance warning of any other short term closures required as part of the works will be provided to allow road users and businesses to plan ahead. We will work with the contractor to ensure that all closures are kept to the minimum necessary to carry out the works safely and efficiently."
(IT)
