Lois Van Valkenburgh, 82, who was active in political, volunteer and civic affairs in Alexandria and served as a legislative aide in Richmond to Del. Mary Marshall (D-Arlington) in the 1970s, died of congestive heart failure Dec. 24 in her home in Alexandria.

Mrs. Van Valkenburgh served eight years on the Virginia Mental Health and Mental Retardation Board and spent a decade on the Alexandria Community Services Board, which she helped found. She served as its chairman.

She had been an organizer and officer of the Friends of the Alexandria Community Health Center. She was a past board chairman of the Alexandria Commission on Aging and had served as its legislative liaison.

Mrs. Van Valkenburgh, who served on the board of the Alexandria Volunteer Bureau, received awards for contributions to the 1998 Aging Expo in Alexandria and for her work on the annual Alexandria Walk to Fight Breast Cancer.

In 1990, she was honored by the Virginia Association of Community Service Boards for 30 years of volunteer work with people with mental disabilities and substance abuse problems.

She was honored by the National Council of Community Mental Health Centers and received an outstanding citizenship award from Alexandria's United Way, where she had served on the executive board, and awards from the American Red Cross and the Alexandria Commission on Women.

Mrs. Van Valkenburgh, a former Capitol Hill lobbyist for the Citizens Committee for UNICEF, twice was elected president of the T.C. Williams High School PTA in the 1960s. She served on the Virginia Congress of Parents and Teachers.

She had been a member of the League of Women Voters since the 1940s and had produced its first Alexandria voters' guide.

A Democrat who had worked for school desegregation, she had managed unsuccessful Virginia congressional campaigns for Warren Quinsted in 1956 and Augustus Johnson in 1964, as well as Virginia General Assembly races in the 1960s for Dennis Lane and Marion Galland.

Mrs. Van Valkenburgh, who came to the Washington area in 1948, was a Wisconsin native and a University of Wisconsin graduate.

Her husband of 52 years, Willard Van Valkenburgh, died in 1998.

Survivors include two sons, Woodie, of Fredericksburg, and Jack, of Boise, Idaho; and a daughter, Blaire Van Valkenburgh of Calabasas, Calif.