September 25, 2009

RiverSource Dimensions Series, Inc.
50606 Ameriprise Financial Center
Minneapolis, Minnesota 55474

Gentlemen:

I have examined the Articles of Incorporation and the By-Laws of RiverSource
Dimensions Series, Inc. (the Company) and all necessary certificates, permits,
minute books, documents and records of the Company, and the applicable statutes
of the State of Minnesota, and it is my opinion that the shares sold in
accordance with applicable federal and state securities laws will be legally
issued, fully paid, and nonassessable.

This opinion may be used in connection with this Amendment to the Registration
Statement.

Sincerely,


/s/ Scott R. Plummer
-------------------------------------
Scott R. Plummer
General Counsel
RiverSource Dimensions Series, Inc.