Gardaí, fire service personnel, RNLI volunteers and Galway County Council road crews were monitoring the situation.
All routes in the area are now passable, although concerns remain about the Dooneen Bridge just off the road from Clifden to Ballyconneely.
Council engineers are checking the bridge to see if it has sustained any structural damage, given the huge volume of water flowing underneath it.
Water levels on the Owenglin River dropped by about 1.8 metres from noon onward.
Locals say the speed at which the flooding occurred is unprecedented.
The manager of the Abbeyglen Castle Hotel in Clifden said the flooding is like nothing he has seen before, describing the deluge as “absolutely terrible”.
Speaking on RTÉ’s News at One, Brian Hughes said the flooding has caused more damage to local properties and lands than the recent storms did.
He said rising river waters have closed roads and blocked off bridges into Clifden and Roundstone, with one local holiday village evacuated of residents and closed after the bridge leading to it was below water.
Mr Hughes said his hotel has been protected so far by a flood defence system it installed in 2014.
He said the “deluge of rain coming down the Owenglin River is absolutely terrible” and he has never seen it burst its banks like this before.
Mr Hughes said that it has been the most horrendous year for hoteliers and businesses.
He said the flooding follows four months of closures and said “we are doing our best to keep going and to stay positive and to try and look after our customers and staff as best we can”.
A senior climatologist at Met Éireann said the amount of rainfall during August and in recent days “is what we would expect in a changing warming world”.
Speaking on RTÉ’s News at One, Keith Lampkin said in “August was unusual” as it saw two named storms back-to-back so late in the storm season.
He said climatologists are constantly looking at trends in climate, adding: “Climate is the average weather over a 30-year period. Weather is what you see when you look out the window.”
He said climate trends are signalling that there will be roughly the same amount of rainfall over the course of a year, but the patterns of that rainfall are likely to change.
“It wasn’t just a wet June, July and August; it was an unusually dry March, April and May.
“But when you look at the whole year to date the amount of rain is in or around what we would normally expect but the pattern in how that rain has fallen, from a very, very dry spring to a quite wet summer, and that is what is causing the frustration.”