Around 20,000 rain-affected people in Agartala left their homes and took shelter in 25 relief camps, a senior official said.
West Tripura District Magistrate Milind Ramteke said 12 boats were engaged in relief and rescue work and NDRF personnel were on alert.
"Water of the Howrah river is flowing above the danger level mark in Agartala," he said.
The weatherman said 109.25 mm of rainfall was recorded in the morning and heavy rain was likely tonight.
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The landslips damaged roads, houses and other infrastructure at several places in Yuksam.
The situation in deluge-battered Assam was slowly crawling back to normal though 44,618 people in the districts of Dhemaji, Lakhimpur, Chirang, Morigaon, Nagaon, Jorhat and Cachar continue to bear the brunt of the flooding.
Nagaon is the worst affected district with 16,484 people marooned. 15,007 were battling floods in Dhemaji and 12,513 in Morigaon.
Altogether 6,580 people are putting up in 19 relief camps in the affected districts. Around 5,700 hectares of crop area has been affected.
The situation in flood-ravaged districts of eastern Uttar Pradesh also inched closer to normal, officials said.
The number of flood-related fatalities in the state has plateaued at 108. No deluge-related death was reported over the last three days, the flood control room at the office of relief commissioner told PTI today.
The flooding in 24 districts of eastern UP affected 27.92 lakh people this year.
A number of deluge-affected people continue to put up in relief camps.
The state government is running 279 flood outposts and 72 centres for distribution of relief material, the officials said.