Chip, a Chocolate Lab, runs with his his ball during a trial run where local dogs make sure the park is puppy-friendly at Crescenta Valley Dog Park on Saturday, Sept. 22, 2012 in La Crescenta.

Chip, a Chocolate Lab, runs with his his ball during a trial run where local dogs make sure the park is puppy-friendly at Crescenta Valley Dog Park on Saturday, Sept. 22, 2012 in La Crescenta. (Libby Cline, for Times Community News / October 18, 2012)

Los Angeles County’s first ever off-leash dog park will officially open to the public Friday, marking the culmination of more than five years of work and grassroots lobbying.

The $645,000, 1.5-acre fenced off area at Crescenta Valley Park, 3901 Dunsmore Ave., was built using funds from Proposition A, approved by voters in 1992 to maintain and upgrade facilities at regional parks, beaches, museums and zoos.

The park includes two sections — one for large dogs and another for smaller canines. There are also drinking fountains, walkways, a 6-foot-high fence and a hose-off area and shade for pet owners.

The park, which went through a trial run last month to test the amenities, is the culmination of a 5 1/2-year effort by the group Community Volunteers for Dogs Off-Leash Gathering and Socializing. The organization’s treasurer, Cheryl Davis, is expected to join other officials, including county Supervisor Mike Antonovich, during the ribbon cutting ceremony at 11 a.m.

Also at the event, animal control officials will hold a pet adoption fair and offer low-cost vaccines for dogs, and Andersen’s Pet Shop will be offering a free microchip service. Other vendors and activities are also planned, according to county officials.

-- Jason Wells, Times Community News

Follow Jason Wells on Google+ and on Twitter: @JasonBretWells