The flag of Oregon is a navy blue field with lettering and symbols in gold, representing the state colors of Oregon. On the obverse, the legend STATE OF OREGON is written above the escutcheon from the Oregon state seal. The shield is surrounded by 33 stars, representing Oregon's admission to the Union as the 33rd state. Below the shield is written 1859, the year in which Oregon became a state.
On the reverse of the flag is a depiction, also in gold, of a beaver, the state animal of Oregon. Oregon has the only U.S. state flag with differing symbolism on two sides.
For dress or parade usage, the flag may feature a gold fringe. For standard usage, no fringe is required. The ratio of the flag's width to length is 3:5.
The current flag design became official on February 26, 1925. Oregon's flag is the last remaining state flag in the U.S. in which the obverse and reverse sides have different designs. Paraguay is the only country that still has a two-sided flag. Two-sided flags were previously more common, but have fallen out of favor due to inherently higher manufacturing costs relative to single-design flags.
The beaver totem is on the reverse side of the current flag. On the new flag it is front and center, with the addition of the star in the “northwest” corner of the flag to represent the state’s position on the map of the United States. Blue and gold are the official state colors. Posted by Preston Knapp 
Proposal for a flag for Oregon. Give the beaver solid ground to stand on. By Qaz Dec 2019 (details)
Part of series of designs for state flags, all in blue and white. (Posted by Ken Morton)
Blue and yellow from current flag, at hoist to symbolize the Pacific coastline. Beaver from current flag on a field of green to symbolize state's forests.
As previous, but with white stripe added to represent Mt Hood and the state's snow-covered peaks.
More symmetrical variation on previous design.
As above, with a more nautical teal at the hoist
Contest to find the best redesign. Voted on 433 designs.