For the sake of completeness....
NFL:Section 3 Goal

CROSSBAR
In the plane of each end line there shall be a centrally placed horizontal Crossbar 18 feet, 6 inches in length, the top face of which is 10 feet above the ground. The goal is the vertical plane extending indefinitely above the crossbar and between the lines indicated by the outer edges of the goal posts.
GOAL POSTS
All goal posts will be the single-standard type, offset from the end line and bright gold in color. The uprights will extend 30 feet above the crossbar and will be no less than 3 inches and no more than 4 inches in diameter. An orange-colored ribbon 4 inches by 42 inches is to be attached to the top of each post.
Note: Goal posts must be padded in a manner prescribed by the League.
The post that holds the crossbar and uprights is placed in the ground 6' 3" behind the endline. Each upright is 70' 9" from the sideline.
NFHS (high school):The goal:
a . The goal is the vertical plane midway between the sidelines extending indefinitely above the inside of the uprights and the front edge of the crossbar and in the same vertical plane as the inside edge of the end line.
b. The top of the crossbar shall be 10 feet above the ground, measured from the base of each upright to the top of the crossbar at the intersection, or at each end of the crossbar perpendicular to the ground when a single pedestal is used.
c. The crossbar shall be 23 feet, 4 inches long.
d. The uprights shall be 23 feet, 4 inches apart inside to inside and each upright may not exceed 4 inches in width. NOTE: It is permissible to use college or professional fields with goal post uprights set at the width specified by their respective codes.
e. The uprights shall extend a minimum of 10 feet above the crossbar.
f. The goal posts shall be padded with resilient, shock absorbing material to a height of at least 6 feet above the ground.
g. The horizontal crossbar and the uprights above it shall be free from any decorative material except paint which is recommended to be either silver, white or yellow in color. One wind directional streamer may be attached to the top of each upright. Wind directional streamers shall be 4 inches in width, 42 inches in length and either red, orange, or yellow in color.