UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  FORM N-17F-2

                                                    ----------------------------
    Certificate of Accounting of Securities and             OMB APPROVAL
       Similar Investments in the Custody of        ----------------------------
           Management Investment Companies          OMB Number: 3235-0360
                                                    Expires: July 31, 2009
      Pursuant to Rule 17f-2 [17 CFR 270.17f-2]     Estimated average burden
                                                    hours per response.......2.1
                                                    ----------------------------

1.   Investment Company Act File Number:            Date examination completed:
     811-1629                                       June 20, 2007

2.   State identification Number:

                                 
AL                 AK   AZ   AR            CA   CO
CT                 DE   DC   FL            GA   HI
ID                 IL   IN   IA            KS   KY
LA                 ME   MD   MA            MI   MN
MS                 MO   MT   NE            NV   NH
NJ                 NM   NY   NC            ND   OH
OK                 OR   PA   RI            SC   SD
TN                 TX   UT   VT            VA   WA
WV                 WI   WY   PUERTO RICO
Other (specify):



3.   Exact name of investment company as specified in registration statement:
     RiverSource Dimensions Series, Inc.

4.   Address of principal executive office (number, street, city, state, zip
     code):
     50606 Ameriprise Financial Center, Minneapolis, MN 55474

INSTRUCTIONS

This Form must be completed by investment companies that have custody of
securities or similar investments.

INVESTMENT COMPANY

1.   All items must be completed by the investment company.

2.   Give this Form to the independent public accountant who, in compliance with
     Rule 17f-2 under the Act and applicable state law, examines securities and
     similar investments in the custody of the investment company.

ACCOUNTANT

3.   Submit this Form to the Securities and Exchange Commission and appropriate
     state securities administrators when filing the certificate of accounting
     required by Rule 17f-2 under the Act and applicable state law. File the
     original and one copy with the Securities and Exchange Commission's
     principal office in Washington, D.C., one copy with the regional office for
     the region in which the investment company's principal business operations
     are conducted, and one copy with the appropriate state administrator(s), if
     applicable.

          THIS FORM MUST BE GIVEN TO YOUR INDEPENDENT PUBLIC ACCOUNTANT



             REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors of
RiverSource Dimensions Series, Inc.:

We have examined management's assertion, included in the accompanying Management
Statement Regarding Compliance with Certain Provisions of the Investment Company
Act of 1940, that RiverSource Disciplined Small Cap Value Fund of RiverSource
Dimensions Series, Inc. (the Fund) complied with the provisions of subsection
(b) and (c) of Rule 17f-2 under the Investment Company Act of 1940 as of March
31, 2007 and during the period from January 31, 2007 (the date of our last
examination) through March 31, 2007. Management is responsible for the Fund's
compliance with those provisions. Our responsibility is to express an opinion on
management's assertion about the Fund's compliance based on our examination.

Our examination was made in accordance with standards established by the Public
Company Accounting Oversight Board (United States) and, accordingly, included
examining, on a test basis, evidence about the Fund's compliance with those
requirements and performing such other procedures as we considered necessary in
the circumstances. Included among our procedures were the following tests
performed as of March 31, 2007 and the period from January 31, 2007 through
March 31, 2007, with respect to securities transactions:

- -    Count and inspection of all securities located in the vault, if any, of
     Ameriprise Trust Company, the Custodian, without prior notice to
     management;

- -    Confirmation of all securities, if any, held by institutions in book entry
     form (Wells Fargo Bank Minnesota, N.A., The Bank of New York, and The
     Depository Trust Company);

- -    Confirmation or examination of underlying documentation of all securities
     purchased but not received, hypothecated, pledged, placed in escrow, or out
     for transfer with brokers, pledges and/or transfer agents;

- -    Reconciliation of all such securities to the books and records of the Fund
     and the Custodian; and

- -    Test of selected security transactions since the date of our last report.

We believe that our examination provides a reasonable basis for our opinion. Our
examination does not provide a legal determination on the Fund's compliance with
the specified requirements.



In our opinion, management's assertion that the Fund was in compliance with the
above mentioned provisions of Rule 17f-2 of the Investment Company Act of 1940
as of March 31, 2007 and for the period from January 31, 2007 through March 31,
2007 is fairly stated in all material respects.

This report is intended solely for the information and use of management of the
Fund and the Securities and Exchange Commission and should not be used for any
other purpose and is not intended to be and should not be used by anyone other
than these specified parties.

                                        /s/ KPMG LLP
                                        ------------
                                        KPMG LLP

Minneapolis, MN
June 20, 2007



             MANAGEMENT STATEMENT REGARDING COMPLIANCE WITH CERTAIN
                PROVISIONS OF THE INVESTMENT COMPANY ACT OF 1940

We, as members of management of RiverSource Disciplined Small Cap Value Fund of
RiverSource Dimensions Series, Inc. (the Fund) are responsible for complying
with the requirements of subsections (b) and (c) of Rule 17f-2, Custody of
Investments by Registered Management Investment Companies, of the Investment
Company Act of 1940. We are also responsible for establishing and maintaining
effective internal controls over compliance with those requirements. We have
performed an evaluation of the Fund's compliance with the requirements of
subsections (b) and (c) of Rule 17f-2 as of March 31, 2007 and from January 31,
2007 through March 31, 2007.

Based on this evaluation, we assert that the Fund was in compliance with the
requirements of subsections (b) and (c) of Rule 17f-2 of the Investment Company
Act of 1940 as of March 31, 2007 and from January 31, 2007 through March 31,
2007, with respect to securities reflected in the investment account of the
Fund.

AMERIPRISE FINANCIAL, INC.


By: /s/ Jeffrey P. Fox
    ------------------------------------
    Jeffrey P. Fox,
    Vice President-Investment Accounting