Pfc. Jeff Gilpin, spokesman for the Havre de Grace Police Department, said portions of Revolution Street and Juniata Street were blocked, leaving Route 155 as the only way in to the city Wednesday night. At the height of the storm, county emergency services said 10 roads were closed in the city.

"Motorists were very safe, and they exercised due caution, which we're very appreciative of," he said Thursday.

Students and staff at Havre de Grace Elementary School had to remain in the building about two and a half hours after the school day ended at 4 p.m. Wednesday because the surrounding streets were flooded.

Students and staff left once conditions were safe, Thomas said.

City residents received a robocall around 9 p.m. Wednesday, informing them that they could not call their police department's main number, 410-939-2121, from their cell phones.

Gilpin said all streets were open and telephone access was clear, as of Thursday. He noted anyone who had an emergency while the cell service was out could still call 911 and be connected to the city police through the county EOC.

"We were able to make sure that any police services were not interrupted," he added.

City spokesman John Van Gilder said a public works employee was injured after being struck by a vehicle while directing traffic around a flooded area at Juniata and Erie Streets. The injury was not serious, he said.

Van Gilder said a section of slope about 50 feet long and 10 feet on the grounds of the Havre de Grace Maritime Museum along Lafayette Street collapsed, but there were no injuries and no damage to the museum facilities.

Van Gilder also urged boaters to be very cautious when navigating the upper portion of the Susquehanna River to avoid tree limbs and other debris that came down river after multiple spill gates of the Conowingo Dam were opened Wednesday.

At 4:30 p.m. Thursday, the Conwingo Spill Hotline was reporting none of the dam's 50 gates were open and the river flow through the dam was 77,000 cubic feet per second.

Little Deer Creek dam

County emergency and public works officials worked Wednesday and Thursday to resolve issues with an earthen dam in the White Hall area, whose integrity had become a concern because of a clogged outlet pipe in the impoundment behind the dam.

Harford County Department of Public Works engineers, joined by emergency manager Ayers and other emergency services officials, assessed the integrity of the earthen dam off the 4400 block of Harford Creamery Road Wednesday morning.

Thomas said Thursday that DPW engineers remain on site, and they plan to lower the water level by 8 to 10 feet over the next "several days" to allow them access to the blocked spillway.

The dam, built in 1961 along Little Deer Creek, holds back approximately 8 million cubic feet of water, according to emergency services officials.

The dam itself appeared to be sound during Wednesday's morning's site visit; however, one official said there appeared to be some seepage of water from the bottom of the grass covered, earth mound.

Aegis staff member Matt Button contributed to this story.