Environment Agency officials have issued a Christmas flood warning for a stretch of the River Nene near Northampton.
Two other areas of the county are also under flood alerts ahead of Met Office forecasts of 24 hours of heavy rain.
Meteorologists issued a warning for up to two inches of rain and heavy winds battering the area from 6am today until 6am on Christmas Eve.
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Environment Agency officials say flooding is "expected" around Cogenhoe Mill caravan site and "possible" on the Nene near Thrapston and on the River Tove between Towcester and Cosgrove.
A spokesman said: "Heavy rain has fallen across the Nene catchment over the past 24 hours and further heavy rainfall is forecast for Wednesday.
"As a result we expect river levels to remain high, affecting the Cogenhoe Mill area for the next few days.
"People should avoid riverside paths and please stay away from river embankments and flood water. We are monitoring the situation, and have staff in the area checking flood defences, clearing blockages, and assisting the emergency services and council.
"Levels on the Middle Nene will remain high for the next few days and and at the Cappenham river gauge on the Tove as a result of persistent heavy rainfall.
"Consequently, flooding of roads and farmland is expected today. We expect flooding to affect River Tove from Towcester to Cosgrove, including Silverstone Brook."
The Environment Agency's Flood Information Service has information on how to prepare ahead for a flood.
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