SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   SCHEDULE TO
                                 (Rule 14d-100)
         Tender Offer Statement Pursuant to Section 14(d)(1) or 13(e)(1)
                     of the Securities Exchange Act of 1934


               PUTNAM CALIFORNIA INVESTMENT GRADE MUNICIPAL TRUST
                       (Name of Subject Company (Issuer))

                            MILDRED B. HOREJSI TRUST
                       (Name of Filing Persons (Offeror))

                    COMMON STOCK, PAR VALUE $0.001 PER SHARE
                         (Title of Class of Securities)

                                    746446103
                      (CUSIP Number of Class of Securities)

                             Stephen C. Miller, Esq.
                            Joel L. Terwilliger, Esq.
                           2344 Spruce Street, Suite A
                             Boulder, Colorado 80302
                                 (303) 442-2156

                                    Copy to:
                              Thomas Stephens, Esq.
                    Bartlit Beck Herman Palenchar & Scott LLP
                         1899 Wynkoop Street, Suite 800
                                Denver, CO 80202
                                 (303) 592-3144
            (Name, Address and Telephone Numbers of Person Authorized
       to Receive Notices and Communications on Behalf of Filing Persons)

                            Calculation of Filing Fee

   Transaction Valuation*                       Amount of Filing Fee**

        $ 66,517,323                                   $7,118.00

- ------------------

*    Estimated  for  purposes  of  calculating  the  amount of filing  fee only.
     Transaction  value derived by multiplying  4,509,649  shares of the subject
     company  (number of shares  sought) by $14.75 (the purchase price per share
     offered by the Mildred B. Horejsi Trust).

**   The amount of the filing fee, calculated in accordance with Rule 0-11 under
     the Securities Exchange Act of 1934, as amended, equals $107 per million of
     the aggregate amount of the cash offered by the Mildred B Horejsi Trust.

|X|  Check  the  box if any  part  of the  fee is  offset  as  provided  by Rule
     0-11(a)(2)  and  identify  the  filing  with which the  offsetting  fee was
     previously  paid.  Identify the previous filing by  registration  statement
     number, or the Form or Schedule and the date of its filing.



Amount Previously Paid: $6,792.00         Filing Party: MILDRED B. HOREJSI TRUST

Form or Registration Number: Schedule TO-T          Date Filed: January 22, 2007

|_|  Check the box if the filing relates  solely to  preliminary  communications
     made before the commencement of a tender offer.


Check the  appropriate  boxes below to designate any  transactions  to which the
statement relates:

      |X|  third-party tender offer subject to Rule 14d-1.

      |_|  issuer tender offer subject to Rule 13e-4.

      |_|  going private transaction subject to Rule 13e-3.

      |_|  amendment to Schedule 13D under Rule 13d-2.

Check the following box if the filing is a final amendment reporting the results
of the tender offer: |_|





                                 AMENDMENT NO. 3
                                       TO
                                   SCHEDULE TO

     This Amendment No. 3 to the Tender Offer  Statement on Schedule TO is being
filed by the Mildred B. Horejsi Trust, an irrevocable grantor trust administered
in accordance with Alaska  administrative  statutes and governed by Alaska trust
law (the  "Trust"),  and  amends and  supplements  the  Tender  Offer  Statement
initially filed with the Securities and Exchange  Commission  ("SEC") on January
22, 2007 (the "Original  Schedule TO"), as amended January 30, 2007 and February
9, 2007.  This  Schedule TO relates to the offer by the Trust to purchase all of
the  outstanding  shares  of  common  stock,  par value  $0.001  per share  (the
"shares"),   of  Putnam   California   Investment   Grade  Municipal   Trust,  a
Massachusetts  business  trust  ("PCA"),  at a price of  $14.75  per  share  (or
approximately  99% of the net  asset  value  of PCA as of the  close  of  market
trading on February 15, 2007),  net to the seller in cash (subject to applicable
withholding of United States federal,  state and local taxes), without interest.
The offer is set forth in the Offer to  Purchase  dated  January  22,  2007,  as
amended,  and the Supplement to the Offer to Purchase dated February 9, 2007 and
as amended  herein,  (the  "Offer to  Purchase")  and in the  related  letter of
transmittal,  as amended  (which,  together with the Offer to Purchase,  and any
amendments  or  supplements  hereto  or  thereto,  collectively  constitute  the
"Offer").  Copies of the Offer to Purchase  and the letter of  transmittal  were
attached as Exhibits (a)(1) and (a)(2),  respectively,  to the Original Schedule
TO. A Supplement to the Offer to Purchase dated February 9, 2007 was attached to
the amended Schedule TO as Exhibit (a)(16) and is amended by this Schedule TO.

     The Original Schedule TO, as amended, is hereby supplemented and amended as
follows:

Item 12.    Exhibits.

     The following Exhibits are added:

        Exhibit   Description

          (a)(19) Form of  Communication  Letter to Shareholders  dated February
                  16, 2007

          (a)(20) Form of Communication  Letter to Shareholders from the Mildred
                  B. Horejsi Trust dated February 16, 2007

          (a)(21) Supplement to the Offer to Purchase dated February 16, 2007

          (a)(22) Form of press  release  issued by the Mildred B. Horejsi Trust
                  dated February 16, 2007

          (a)(23) Form of amended letter of transmittal to the Offer to Purchase
                  dated February 16, 2007

          (a)(24) Form of  Letter  to  Broker-Dealers,  as  amended,  and  dated
                  February 16, 2007

          (a)(25) Form of Letter to Broker-Dealer Clients, as amended, and dated
                  February 16, 2007







                                    SIGNATURE

     After due inquiry  and to the best of my  knowledge  and belief,  I certify
that the information set forth in this statement is true, complete, and correct.


                                       MILDRED B. HOREJSI TRUST

                                       By:  Badlands Trust Company, LLC, trustee

                                       By:  /s/ Stephen C. Miller
                                       Name: Stephen C. Miller
                                       Title: President


                                       Dated: February 16, 2007



                                  EXHIBIT INDEX

     (a)(1) Offer to Purchase, dated January 22, 2007*

     (a)(2) Letter of Transmittal.*

     (a)(3) Notice of Guaranteed Delivery.*

     (a)(4) Letter to Brokers,  Dealers,  Commercial Banks,  Trust Companies and
            Other Nominees.*

     (a)(5) Letter to Clients for Use by  Brokers,  Dealers,  Commercial  Banks,
            Trust Companies and Other Nominees.*

     (a)(6) Guidelines for  Certification of Taxpayer  Identification  Number on
            Substitute Form W-9*


     (a)(7) Summary  Advertisement,  as published in the western  edition of the
            Wall Street Journal on January 22, 2007.*

     (a)(8) Form of press release issued January 22, 2007*

     (a)(9) Form of Request for Stockholder  List as provided to the Trustees of
            PCA and dated January 22, 2007*

     (a)(10) Form of Request for Stockholder  List Pursuant to Rule  14d-5(a)(a)
             under the Exchange Act of 1934*

     (a)(11) Form of Shareholder Communications Insert*

     (a)(12) Form of Cover Letter Provided to Shareholders*

     (a)(13) Form of  Communication  Letter to  Shareholders  dated  January 29,
             2007**

     (a)(14) Form of  Communication  Letter to  Shareholders  dated  February 9,
             2007***

     (a)(15) Form of  Communication  Letter to Shareholders  from the Mildred B.
             Horejsi Trust dated February 9, 2007***

     (a)(16) Supplement to the Offer to Purchase dated February 9, 2007***

     (a)(17) Form of Letter to Broker-Dealers, as amended, and dated February 9,
             20007***

     (a)(18) Form of Letter to  Broker-Dealer  Clients,  as  amended,  and dated
             February 9, 2007***

     (a)(19) Form of  Communication  Letter to  Shareholders  dated February 16,
             2007

     (a)(20) Form of  Communication  Letter to Shareholders  from the Mildred B.
             Horejsi Trust dated February 16, 2007

     (a)(21) Supplement to the Offer to Purchase dated February 16, 2007

     (a)(22) Form of press release  issued by the Mildred B. Horejsi Trust dated
             February 16, 2007

     (a)(23) Form of  amended  letter of  transmittal  to the Offer to  Purchase
             dated February 16, 2007

     (a)(24) Form of Letter to  Broker-Dealers,  as amended,  and dated February
             16, 2007

     (a)(25) Form of Letter to  Broker-Dealer  Clients,  as  amended,  and dated
             February 16, 2007

     (b)(1) Cash  Management  Account  Agreement  between  the Trust and Merrill
            Lynch, Pierce, Fenner & Smith Incorporated.*

     (b)(2) Revolving  Line of Credit Between the Trust and the Lola Brown Trust
            No. 1B*

     (d)  Not Applicable

     (g)  Not Applicable

     (h)  Not Applicable


*    Previously  filed  with the SEC on  January  22,  2007  (accession  number:
     0001099343-07-000002).

**   Previously  filed  with the SEC on  January  30,  2007  (accession  number:
     0001099343-07-000003).

***  Previously  filed  with  the SEC on  February  9,  2007  (accession  number
     0001099343-07-000005).