The phrase "a slipway" is correct and usable in written English.
It is typically used to refer to a ramp or slope used for launching or recovering boats and ships.
Example: "The boat was carefully guided down the slipway into the water for its first voyage."
Alternatives: "a launch ramp" or "a boat ramp".
Given that she was launched from a slipway here in 1946, there could be few more welcome homecomings.
Next to it is the Oss Wash, a slipway where traders could (you can probably guess) wash their horses.
Follow the bank as it zigzags past the tile works and as far as a slipway that descends to a cinder track below the bank.
At a slipway in Falmouth I watched a man row ashore in a boat that looked as if it was made of old fabric and twigs.
Reaching a slipway guarded on their approach by a fence running down into the water, some of the men plunged into the river and began swimming upstream.
Pictures and video posted on social media showed smoke rising from the terminal building through shattered windows, devastation inside the departure hall with ceiling tiles and glass scattered across the floor, and passengers running along a slipway, dragging their bags behind them.
So many worked there that at clocking off "it would take half an hour, easy" to nose your car down its mile-and-a-half slipway.
Meanwhile, TK keeps up his nature guide's vigilance, spotting an emerald vine snake camouflaged among the foliage, a crocodile slipway at the water's edge, VC and an exquisite sunbird nest – fashioned from spider webs and lichen – in which we can just see the protruding bill of the sitting female.
It is necessary to use an inclined slipway to launch a large lifeboat in locations where there is no natural harbour or where there is a large tidal range.
The causes of high friction and wear during the RNLI's lifeboat launches along an inclined slipway are investigated with a view to reducing the environmental impact due to slipway panel wear and lubricant release into the marine environment.
There were several of them close by: dark, deep ponds that had once been quarries; a ruined slipway built to take seaplanes; steel rings that had tethered barrage balloons; an abandoned railway tunnel where bats flew.
