X0201 4 2004-04-19 0 0000856716 WESTERN GAS RESOURCES INC WGR 0001228362 STONEHOCKER WALTER L 1099 18TH STREET, SUITE 1200 DENVER CO 80202 1 0 0 0 Common Stock 2004-04-19 4 S 0 84347 53.97 D 2267933 I See footnote Shares sold pursuant to a Rule 10b5-1 Plan. Reporting Person holds 1,268,045 shares of common stock directly and the remainder are held either by the Reporting Person and his spouse as joint tenants or by his spouse. /s/ John C. Walter, as Attorney-in Fact for Walter L. Stonehocker 2004-04-21