A tree fell on a woman on Old Forge Road Thursday night, but the woman refused to be taken to the hospital, Bassett said.
Emergency crews also responded to a call of a tree on a house on Roxbury Road, but the extent of the damage was not known, Bassett said.
Allegheny Power crews were expected to work around the clock to restore power, but spokesman Jay Johnson did not have an estimated timeline.
Allegheny Power customers accounted for all but 100 of those customers.
In Washington County 2,174 customers had been without power since 8:30 p.m., Johnson said.
Allegheny had 7,095 customers without power in Frederick County, Md., 2,100 customers in Franklin County, Pa.; 46 in Fulton County, Pa.; 830 in Berkeley County, W.Va.; 2,700 in Jefferson County, W.Va.; and 510 in Morgan County, W.Va.
Boonsboro Mayor Charles F. "Skip" Kauffman said the power went out in the north end of town at about 8:30 p.m.
"We've been here lighting candles," Kauffman said. "I'm standing here in the dark."
"We got a lot of people affected," he said.
About 100 of 17,000 customers of Hagerstown City Light were without power between 7:30 and 9 p.m. Thursday, Assistant Manager Karl Kohler said.
Kohler said about 50 customers had power back on by 9 p.m. Thursday and that the remaining 50 customers would have their power restored about 30 minutes later.
"We're pretty lucky at this point," Kohler said.
Kohler said officials expected outages to increase beginning at about midnight as the storm's intensity picks up.
Verizon Spokeswoman Sandra Arnette said there were no major problems with phone service as of about 8:30 p.m.
The Tri-State area was expected to be pounded by heavy rains and winds from 35 to 40 mph through the night, National Weather Service Meteorologist Jim Travers said.
"But by mid-morning to late morning things should really begin to improve," Travers said. Some sunlight might break through in the afternoon, he said.
Total rainfall from the hurricane, which was expected to diminish to a tropical storm by the time it hit this area, could be as much as 6 to 10 inches in the mountainous areas, Travers said. The Hagerstown area could get 4 to 7 inches, he said.
The big issue overnight was the heavy rains and gusts of wind that were expected to be in the 50 mph range, Travers said.
The highest gust the Hagerstown area experienced as of 9:48 p.m. Thursday was 50 mph, according to local weather observer Greg Keefer's Web site. At least half an inch of rain had fallen Thursday.
Small streams could flood, depending on how much rain falls in the larger river basins such as the Potomac River, Travers said.
Isabel was affecting an area 100 to 200 miles from its center, he said.
Four people were staying at the American Red Cross' emergency shelter at North Hagerstown High School as of 8:30 p.m. Thursday, said Cindy Blackstock Kline, Red Cross director of emergency services.
The Red Cross also set up a shelter at Maugansville Goodwill Volunteer Fire Co. The fire company's bingo night was canceled to make room for the shelter.
Someone had come into the Maugansville shelter Thursday afternoon, but left to stay with relatives in the area, Shelter Manager Joyce Martin said.
The North High shelter had a Ham operator working in case the phone lines went down.
Radio Amateur Civil Emergency Service, or RACES, had a Ham operator at the county's Emergency Operations Center and was expecting other volunteer Ham operators to help at other locations, volunteer Joe Elliott said.
Leitersburg Volunteer Fire Co. officials were considering opening an emergency shelter at the former grange building if needed, Fire Chief Kirk Mongan said.
Anyone who needs to check on whether a shelter had opened at the former grange hall, at 21140 Leitersburg Pike, can call the fire hall at 301-733-9155.
If necessary, the Hancock Fire Co. will open a shelter at Hancock Middle-Senior High School, Fire Chief Ernest Truax said.
If anyone in the Hancock area needs shelter, they can call the fire department at 301-678-7739, Truax said.
Valley Mall officials planned to close the mall early, at 7 p.m. Thursday, Marketing Director Julie Simmons said. Simmons anticipated reopening the mall at noon today.
According to Bassett, the following roads were closed or blocked by trees and/or wires down on Thursday night.
- Eylert Avenue at Fort Ritchie road was closed indefinitely due to downed trees and lines.
- Both lanes of Alternate U.S. 40 at death curve were blocked by downed trees.
- Trees were down at Oak Ridge Drive at Halfway Boulevard.
- Trees were down on U.S. 40 at Cool Hollow Road.
- Trees and wires were down in the 3300 block of Harpers Ferry Road.
- Trees and wires were down at Kaetzel Road at Brownsville Road.
- Trees were down at U.S. 40 at the antiques mall.
- Tree were down at Sherman Avenue at Armstrong.
- Trees were down at Herman Myers Road near Leitersburg-Smithsburg Road.
- Trees were down at Old Forge Road near Old Forge Elementary School.
- Trees were down at Keadle Road.
The Maryland State Highway Administration reported that Md. 77 from the Washington County line to Pryor Road in Thurmont, Md., was closed until at least daylight today.
Staff writer Tara Reilly contributed to this story.