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The Mayor said that he hoped the so-called Silvertown link could be built within the next 10 years to carry 2,400 vehicles per hour in each direction.
Transport for London will begin consultation on the plan next month.
However, east London Assembly member John Biggs blamed Mr Johnson for scuppering previous plans, including the £450m Thames Gateway Bridge in November 2008
“One of Boris Johnson's first moves when he came to power was to scrap plans for a new bridge in east London and throw away its funding to the tune of hundreds of millions,” Mr Biggs said.
"We've now been waiting almost four years. If he hadn't been so short sighted back in 2008 we could have been opening a river crossing now. Instead all we have is a tunnel that is years away and doesn't appear to have any funding behind it.
"The Silvertown crossing was always supposed to go alongside the Thames Gateway Bridge. There is a risk that by building just one road, very close to the Blackwall Tunnel, additional capacity will come at the expense of increased congestion in the area. The package of two crossings is still needed."
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