Causes of Excessive Phlegm & Mucus in the Throat. While chronic phlegm does become a serious cause for worry for many, the truth is that there are a number of reasons for phlegm or excessive mucus in throat. For some, it may just be a case of morning reflux, with no excessive production of flem during the rest of the day.
The Red River in Minnesota and Canada every dozen years freezes and then thaws unevenly causing floods unless towns build dikes or huge diversion dams like at Winnipeg in Canada. Now in 2009 the Mississippi River freezes north of Iowa, and south of Iowa there are patches of freezing. Around 1900 in St. Louis the river froze which surprised most there although it was really an ice dam of millions of icebergs, and people walked across this ice gorge of ice jams.
The Mississippi River is the largest system of rivers in the United States and it is the world's fourth largest river system. In total, the river is 2,320 miles (3,734 km) long and its drainage basin covers an area of 1,151,000 square miles (2,981,076 sq km). The source of the Mississippi River is Lake Itasca in Minnesota and the mouth of the river is the Gulf of Mexico. There are also a number of large and small tributaries of the river, some of which include the Ohio, Missouri and Red Rivers .