the same station reported 311 mm (12.2 in) in about three hours. The Weather Forecast Office on the island reported 265 mm (10.4 in) in a 24-hour period. The rains were less than 250 mm (10 in) in northern Guam, and were highest in the mountainous southern region where the eye crossed. While moving across the island, Chataan produced a significant storm surge that peaked at about 3.6 m (12 ft) in Umatac. High winds caused damage across Guam, mostly to roofs and to poorly built or wooden structures. A total of 1,996 houses were severely damaged or destroyed. Better constructed homes fared well during the storm, and there was little window damage. The winds also downed power lines, leaving an island-wide power outage. John F. Kennedy High School sustained damage to its football field and library. The most significant effects were from the heavy rainfall, resulting in landslides in some areas and causing rivers to flow at above-normal rates; 14 stations reported either record flow rates or peak crests, including an island-wide peak crest of 8.55 m (28.06 ft) at the mouth of the Tolaeyuus River. Two water gauges were destroyed during the storm. Swollen rivers damaged roads, washed away trees, and caused erosion. The storm flooding contaminated Fena Lake, which provides water to the military base, for a few days. In addition, 34 of the island's 110 water wells failed due to the storm. Flooding also destroyed a building and damaged the runway at Antonio B. Won Pat International Airport, and damaged a bridge near Inarajan. A few palm trees fell due to the soil being loosened, either from heavy rains or high waves. Some of the downed trees struck cars, but the winds were not strong enough to overturn any vehicles. In the higher elevations of Guam, some areas experienced heavy crop damage due to strong winds; however, crop damage in general was less than expected, estimated at around $500,000. In Apra Harbor, high seas washed ashore or sank five boats, and a Navy barge spilled 397,000 litres (105,000 gallons) of oil. Overall, Chataan caused about $60 million in property damage on Guam, and there were 23 injuries, none of them serious. Elsewhere North of Guam, Chataan affected Rota with 74 km/h (46 mph) sustained winds and gusts to 120 km/h (75 mph) at the island's airport. Rainfall was much less than elsewhere in the typhoon's path,