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

                                  FORM N-17F-2

               Certificate of Accounting of Securities and Similar
                          Investments in the Custody of
                         Management Investment Companies

                    Pursuant to Rule 17f-2[17 CFR 270.17f-2]

- --------------------------------------------------------------------------------
1. Investment Company Act File Number:        Date examination completed:

   811-1629                                   October 22, 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 Funds

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 the following Funds:

     RiverSource Cash Management Fund,
     RiverSource Growth Fund,
     RiverSource Limited Duration Bond Fund,
     RiverSource Core Bond Fund,
     RiverSource Income Opportunities Fund,
     RiverSource Short Term Cash Fund,
     RiverSource Inflation Protected Securities Fund,
     RiverSource VP - Cash Management Fund,
     RiverSource Strategic Allocation Fund,
     RiverSource Floating Rate Fund,
     RiverSource Disciplined Small and Mid Cap Equity Fund,
     RiverSource Disciplined Large Cap Growth Fund,
     RiverSource Strategic Income Allocation Fund;

of the RiverSource Funds (referred to collectively as the Funds) complied with
the requirements of subsections (b) and (c) of rule 17f-2 of the Investment
Company Act of 1940 (the Act) as of July 31, 2007. Management is responsible for
the Funds' compliance with those requirements. Our responsibility is to express
an opinion on management's assertion about the Funds' compliance based on our
examination.

Our examination was conducted in accordance with the standards of the Public
Company Accounting Oversight Board (United States) and, accordingly, included
examining, on a test basis, evidence about the Funds' 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 July 31, 2007, and with respect to agreement of security
purchases and sales, for the period from August 1, 2006 through July 31, 2007:

- -    Count and inspection of all securities located in the vault of Ameriprise
     Trust Company (the Custodian) was not performed as no securities of the
     Funds were held in the Custodian's vault;

- -    Confirmation of all securities held by institutions in book entry form
     (Wells Fargo and Depository Trust Company);

- -    Confirmation of all securities hypothecated, pledged, placed in escrow, or
     out for transfer with brokers, pledgees, or transfer agents;

- -    Review of reconciliation of all such securities to the books and records of
     the Funds and the Custodian;

- -    Agreement of twelve security purchases and thirteen security sales or
     maturities from the books and records of the Funds to broker confirmations.

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

In our opinion, management's assertion that the Funds complied with the
requirements of subsections (b) and (c) of rule 17f-2 of the Act as of July 31,
2007, with respect to securities reflected in the investment accounts of the
Funds is fairly stated, in all material respects.

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


                                        /s/ Ernst & Young LLP

Minneapolis, Minnesota
October 22, 2007



    Management Statement Regarding Compliance With Certain Provisions of the
                         Investment Company Act of 1940

October 22, 2007

I, as a member of management of the RiverSource Cash Management Fund,
RiverSource Growth Fund, RiverSource Limited Duration Bond Fund, RiverSource
Core Bond Fund, RiverSource Income Opportunities Fund, RiverSource Short Term
Cash Fund, RiverSource Inflation Protected Securities Fund, RiverSource VP -
Cash Management Fund, RiverSource Strategic Allocation Fund, RiverSource
Floating Rate Fund, RiverSource Disciplined Small and Mid Cap Equity Fund,
RiverSource Disciplined Large Cap Growth Fund, RiverSource Strategic Income
Allocation Fund of the RiverSource Funds (referred to collectively as the
Funds), am 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. I am also
responsible for establishing and maintaining effective internal controls over
compliance with those requirements. I have performed an evaluation of the Funds'
compliance with the requirements of subsections (b) and (c) of rule 17f-2 as of
July 31, 2007, and from the date of the last examination of each fund through
July 31, 2007.

Based on this evaluation, I assert that the Funds were in compliance with the
requirements of subsections (b) and (c) of rule 17f-2 of the Investment Company
Act of 1940 as of July 31, 2007, and from the date of the last examination of
each fund through July 31, 2007, with respect to securities reflected in the
investment accounts of the Funds.


By: /s/ Jeffrey P. Fox
    --------------------------------
    Jeffrey P. Fox
    Treasurer
    RiverSource Funds