Masonry from the wall fell from the road onto undergrowth next to the riverside greenway.
It is unclear whether the wall was struck by a vehicle or collapsed due to structural failure.
A large gap at the footpath opposite the Braehead Road remained on Wednesday leaving a severe drop of several metres to the bricks and vegetation below.
Some of the damaged masonry remained loose and at risk of further collapse.
1. A large gap has been left in the wall on the main Derry to Letterkenny Road.
A large gap has been left in the wall on the main Derry to Letterkenny Road. Photo: Kevin Mullan
2. The collapsed wall near the bottom of the Braehead Road.
The collapsed wall near the bottom of the Braehead Road. Photo: Kevin Mullan
3. Masonry remained loose and in danger of further collapse.
Masonry remained loose and in danger of further collapse. Photo: Kevin Mullan
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