Two of the best steeplechase races of the year today as the Bowman Bowl is run at Fairfax and the Grand National at Fair Hill, Md.

Mrs. Donald Culver's Dosdi, top timber horse in the country in 1976 and winner of the Bowman last year, goes after a second consecutive victory against 10 rivals in the three mile feature of the Fairfax Steeplechase program at Belmont Plantation, near Leesburg. Post time for the first of six races is 2 p.m.

Fair Hill's Grand National, a handicap at 2 1/2 miles over 15 brush jumps, has drawn 11 entries, including last year's winner, Deux Coup. Included in the blue-ribbon field are Leaping Frog, Cafe Prince, Straight and True, Happy intellectual, Don Panta, Fire Control, Tib's Eve. Popular Hero, Rocking and Owhata Chief, winner of the Manly Handicap in a stunning upset last Saturday.

Offering parimutuel wagering, Fair Hill's eight-race program begins at 1:30 p.m.

A crowd of close to 15,000 is expected for the Fairfax meeting, run over the "English type" course at Belmont Plantation. Top rival to Dosdi, scheduled to be ridden by trainer Charley Fenwick, is Juggernaut II, the 9-year-old chestnut that won back-to-back races at Foxfield, the first last May and the other two weeks ago.

Completing the field are Traveling Son, Moe Green, Jaymade, Short Song, Hub City King, Champerty, Joe Finn, Master's Degree and Christmas.