 The worst effects from the storm occurred in Galveston County . Waves of 7 feet ( 2 m ) in height were reported on High Island during Chantal , while Kemah measured tides of 3 @.@ 8 feet ( 1 @.@ 1 m ) , and the Galveston Flagship pier reported 3 @.@ 5 feet ( 1 m ) seas . The high tides eroded more than 1 mile ( 1 @.@ 6 km ) of Texas State Highway 87 , while at least another 15 miles ( 24 km ) of that highway was covered in sand and debris . As a result , the highway was expected to be closed for at least five weeks , though in October 1989 , storm surge from Hurricane Jerry caused more erosion , and no repairs have been made since . In the northern portions of Galveston County , rainfall was generally at least 12 inches ( 300 mm ) , which a peak of 20 inches ( 510 mm ) in Friendswood . Numerous streets in League City , Dickinson , and Friendswood were flooded for more than 24 hours . At least 100 homes in Friendswood were flooded , while water entered 70 % of houses in Dickinson . Severe street flooding and ponding occurred in Galveston , especially in the low @-@ lying areas ; some homes and businesses were damaged , as a result . Overall , 500 homes in the county were flooded . 
