As the final week of the broadcast season winded down, Fox rolled to its 19th straight Tuesday victory behind “American Idol” and series-high scores from drama “House,” according to preliminary nationals from Nielsen.

From 8 to 9, “American Idol” (11.2 rating/29 share in adults 18-49, 27.2 million viewers overall) delivered its best Tuesday finale numbers for any of its four editions, topping the other five broadcast nets combined by 5% in 18-49. Heading into tonight’s finale, this has been the highest-rated “Idol” season to date. “House” then cleaned up at 9 with its first-season finale (7.7/18 in 18-49, 19.7 million

viewers overall), winning convincingly in nearly all categories.

NBC placed second on the night, with “Law & Order: SVU” winning easily at 10 (5.8/15 in 18-49, 15.9 million viewers overall) and the finale of boxing skein “The Contender” doing solid numbers from 8 to 10 (3.8/9 in 18-49, 8 million viewers overall), running second to Fox in adults 18-34 (4.2/11).

At CBS, “NCIS” placed second in key categories at 8 (3.5/9 in 18-49, 14.3 million viewers overall) and two-hour special “Rob & Amber’s Wedding” did credible numbers from 9 to 11 (3.6/9 in 18-49, 9.9 million viewers overall).

Elsewhere, ABC bombed with its Donald Trump biopic “Trump Unauthorized” (2.1/5 in 18-49, 5.9 million viewers overall) as did UPN with the premiere of its comedy “Bad Girl’s Guide to Dating” at 9:30 (0.8/2 in 18-49, 1.9 million viewers overall).

At the WB, the two-hour season finale of “One Tree Hill” (1.6/4 in 18-49, 3.7 million viewers overall) ran second to Fox in females 12-34 (3.6/9).

Preliminary 18-49 averages for the night: Fox, 9.5/24; NBC, 4.4/11; CBS, 3.6/9; ABC, 2.0/5; WB, 1.6/4; UPN, 1.1/3.

In total viewers: Fox, 23.5 million; CBS, 11.4 million; NBC, 10.6 million; ABC, 5.8 million; WB, 3.7 million; UPN, 2.5 million.