Shot from the skies, the photos show miles of land awash with muddy water after heavy rain overnight on Monday sent river levels soaring above 22ft (6.79m) in the hardest-hit areas.
Homes dot the landscape like islands as residents wade through streets transformed into streams.
Police have started an "immidiate evacuation" in the town of Ironbridge, Shropshire, after water levels got so high that they breached flood defences.
It comes as the Met Office warns communities in Wales and north-western England are set to see another 2cm to 4cm of rain.
Railway lines in Shrewsbury have been closed due to the rising water levels close to the viaduct.
Network Rail said: “The exceptionally high water levels in the Severn and the closure of these lives serve to highlight the extreme weather we’ve experienced across the network over the last few weeks.
“The current situation in Shrewsbury is very much a once-in-a-generation event.”
It said engineers would be undertaking an underwater inspection of the viaduct’s structure on Wednesday morning before lines can reopen.
👷♀️👷 Our teams have worked around the clock to respond to issues caused by #StormCiara and #StormDennis and additional heavy rainfall, and get passengers moving again. 🌧
Here’s an update of some of our progress:
🎥 : Treherbert to Rhonda pic.twitter.com/yEa3M04eKT— Network Rail (@networkrail)February 25, 2020
Residents in the Worcestershire town of Bewdley were forced to evacuate after the river spilled over barriers at Beales Corner.
Mark Bowers, a flood risk manager at the Environment Agency, tweeted: “Huge amounts of water in the system.
“Thoughts with the local community who have been impacted.”
Gutted to see the low level temporary defences overtopped at #BealesCorner, #Bewdley overnight. Huge amounts of water in the system.
Thoughts with the local community who have been impacted. https://t.co/2LcYffsOWC— Mark Bowers (@MarkBowersEA)February 26, 2020
Earlier the force of the river forced flood defences backwards in Ironbridge. They had initially managed to hold.
Shortly after 1am on Wednesday, Chief Superintendent Tom Harding, of West Mercia Police, tweeted: “The barrier appears intact but has indeed moved. This will be monitored throughout the night.”
Speaking at Ironbridge on Wednesday morning, Marc Lidderth, EA environment manager, said water levels had dropped by about 0.3in (1cm).
But he added: “The severe flood warning that we have issued here at Ironbridge is still in force, which means there is a significant risk to life, so we need people to remain vigilant and to listen to the advice that’s coming from the emergency services.”
Had a report of the flood barrier having moved at Ironbridge. @SuptMoLansdale and I immediately attended and chaired a meeting of partners at midnight. The barrier appears intact but has indeed moved. This will be monitored throughout the night. Next partner meeting 8am. pic.twitter.com/DzaccNvacc— Chief Superintendent Tom Harding (@CSuptHarding)February 26, 2020
The agency is keeping a close eye on the barriers on the Severn, Mr Lidderth said. He added that drones may be used later today to assess the defences.
Roads around the Ironbridge Gorge were closed to stop people driving in floodwater, Telford and Wrekin Council said.
The level of the River Severn reached more than 22ft (6.79m) in the Shropshire village of Buildwas at around 8.30am on Wednesday – up from a level of 16ft (4.19m) on Sunday.
In the North East, flood warnings remain in place in the Snaith area, in East Yorkshire, ahead of a high tide on Wednesday morning.
The Environment Agency said the washlands at Gowdall Ings are continuing to fill and are overtopping, as designed, into Snaith Ings, with flooding affecting properties nearby.
Hull Coastguard Rescue Team joined other agencies, including police, fire and ambulance services, on Tuesday night to alert residents and help with evacuations.
On Tuesday, East Riding of Yorkshire Council said that 10 properties – seven commercial and three residential – had flooded in Snaith and the road north of the town had been closed.
The Snaith School said it will be closed on Wednesday as a precaution and Snaith Primary School also remains closed.
On Wednesday morning there were two severe flood warnings – meaning there is a risk to life – on the River Severn.
There are 2 #SevereFloodWarnings in place in #Shropshire.
Know what to do in a flood and check your flood risk:https://t.co/6sQvhutQ0p #Floods #Flooding #Shrewsbury #Ironbridge pic.twitter.com/En094TYdMT— Environment Agency (@EnvAgency)February 26, 2020
There were a further 102 flood warnings and 146 flood alerts in place stretching from the Lake District down to the south coast, with heavy concentrations in the North East and South West.
Many towns the length of the River Severn were also at risk.
Oli Claydon, a Met Office spokesman, said western parts of the UK would see a pattern of sunshine and showers over Wednesday and Thursday.
He said the volume of rain would ordinarily “be nothing to be overly concerned about”, but added any further rain could have an impact on flooded communities.
“In some of those regions through that period of rainfall, particularly into the Severn catchment, the total won’t necessarily be a huge amount but in any of those places that are seeing flooding, any further rain is not welcome,” he said.
Mr Claydon said that most of the UK would be dry by Thursday evening, before more heavy rain moves in from the west on Friday.
“In terms of impact, the main thing we are keeping an eye on now is Friday,” he said.
“That is another area of concern – there could be yellow rain warnings on Friday in terms of the accumulations that could be expected from that rainfall.”
He said south-west England, southern parts of Wales and north-west England were expected to see the most rain on Friday and into the weekend.