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

                                  SCHEDULE 13G
                    Under the Securities Exchange Act of 1934
                              (Amendment No. ___) *

                           Kaiser Aluminum Corporation
--------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common stock, par value $.01 per share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    483007704
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                               September 18, 2006
--------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

[ ]    Rule 13d-1(b)
[X]    Rule 13d-1(c)
[ ]    Rule 13d-1(d)

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

CUSIP Number: 483007704


1.   Names of Reporting Persons
     I.R.S. Identification Nos. of above Persons (entities only).

     Witmer Asset Management 13-3735486

2.   Check the Appropriate Box if a Member of a Group (See Instructions)
     (a)     [ ]
     (b)     [X]

3.   SEC Use Only


4.   Citizenship or Place of Organization

     Delaware

 NUMBER OF SHARES    5.     Sole Voting Power
BENEFICIALLY OWNED
 BY EACH REPORTING          0
      PERSON
       WITH
                     6.     Shared Voting Power

                            1,071,216

                     7.     Sole Dispositive Power

                            0

                     8.     Shared Dispositive Power

                            1,071,216

9.   Aggregate Amount Beneficially Owned by Each Reporting Person

     1,071,216

10.  Check Box if the  Aggregate  Amount in Row 9 Excludes  Certain  Shares (See
     Instructions)

     [ ]

11.  Percent of Class Represented by Amount in Row (9)

     5.2%

12.  Type of Reporting Person (See Instructions)

     OO

CUSIP Number: 483007704


1.   Names of Reporting Persons
     I.R.S. Identification Nos. of above Persons (entities only).

     Charles H. Witmer

2.   Check the Appropriate Box if a Member of a Group (See Instructions)

     (a)   [ ]
     (c)   [X]

3.   SEC Use Only


4.   Citizenship or Place of Organization

     U.S.A.

 NUMBER OF SHARES    5.     Sole Voting Power
BENEFICIALLY OWNED
 BY EACH REPORTING          10,000
      PERSON
       WITH
                     6.     Shared Voting Power

                            1,090,216

                     7.     Sole Dispositive Power

                            10,000

                     8.     Shared Dispositive Power

                            1,090,216

9.   Aggregate Amount Beneficially Owned by Each Reporting Person

     1,100,216

10.  Check Box if the  Aggregate  Amount in Row 9 Excludes  Certain  Shares (See
     Instructions)

     [ ]

11.  Percent of Class Represented by Amount in Row (9)

     5.4%

12.  Type of Reporting Person (See Instructions)

     IN

CUSIP Number: 483007704


1.   Names of Reporting Persons
     I.R.S. Identification Nos. of above Persons (entities only).

     Meryl B. Witmer

2.   Check the Appropriate Box if a Member of a Group (See Instructions)

     (a)   [ ]
     (b)   [X]

3.   SEC Use Only


4.   Citizenship or Place of Organization

     U.S.A.

 NUMBER OF SHARES    5.     Sole Voting Power
BENEFICIALLY OWNED
 BY EACH REPORTING          0
      PERSON
       WITH
                     6.     Shared Voting Power

                            1,090,216

                     7.     Sole Dispositive Power

                            0

                     8.     Shared Dispositive Power

                            1,090,216

9.   Aggregate Amount Beneficially Owned by Each Reporting Person

     1,090,216

10.  Check Box if the  Aggregate  Amount in Row 9 Excludes  Certain  Shares (See
     Instructions)

     [ ]


11.  Percent of Class Represented by Amount in Row (9)

     5.3%

12.  Type of Reporting Person (See Instructions)

     IN

CUSIP Number: 483007704


Item 1.   Name of Issuer
          (a)   Name of Issuer:
                Kaiser Aluminum Corporation

          (b)   Address  of  Issuer's  Principal  Executive  Offices:
                27422  Portola  Parkway,  Suite 350
                Foothill  Ranch, California 92610-2831

Item 2.   Name of Person Filing
          (a)   Name:
                Witmer Asset Management
                Charles H. Witmer
                Meryl B. Witmer

          (b)   Address  of  Principal   Business  Office:
                One  Dag Hammarskjold  Plaza
                885 2nd  Avenue,  31st  Floor
                New York, New York 10017

          (c)   Citizenship:
                U.S.A.

          (d)   Title of Class of Securities:
                Shares of Common stock, par value $.01 per share

          (e)   CUSIP Number: 483007704

Item 3.   If  this  statement  is  filed  pursuant  to s.240.13d-1(b)  or
          s.240.13d-2(b) or (c), check whether the person filing is a:

          (a)   [ ] Broker or dealer registered under Section 15 of the Act.

          (b)   [ ] Bank as defined in section 3(a)(6) of the Act.

          (c)   [ ] Insurance company as defined in section 3(a)(19) of the Act.

          (d)   [ ] Investment   company  registered  under  section  8  of  the
                    Investment Company Act of 1940.

          (e)   [ ] An    investment    adviser   in    accordance    with   ss.
                    240.13(d)-1(b)(1)(ii)(E).

          (f)   [ ] An employee  benefit  plan or endowment  fund in  accordance
                    with ss. 240.13d-1(b)(1)(ii)(F).

          (g)   [ ] A parent  holding  company or control  person in  accordance
                    with ss. 240.13d-1(b)(ii)(G)

          (h)   [ ] A savings  association  as defined  in  Section  3(b) of the
                    Federal Deposit Insurance Act (12 U.S.C. 1813).

          (i)   [ ] A church plan that is  excluded  from the  definition  of an
                    investment  company under section 3(c)(14) of the Investment
                    Company Act of 1940.

          (j)   [ ] Group, in accordance with ss. 240.13d-1(b)(1)(ii)(J).

Item 4.   Ownership.

          (a)   Amount Beneficially Owned:
                Witmer Asset Management 1,071,216 shares
                Charles H. Witmer 1,100,216 shares
                Meryl B. Witmer 1,090,216 shares

          (b)   Percent of Class:

                Witmer Asset Management 5.2%
                Charles H. Witmer 5.4%
                Meryl B. Witmer 5.3%

          (c)   Number of shares as to which the person has:

                (i)  sole power to vote or to direct the vote:
                     Witmer Asset Management 0 shares
                     Charles H. Witmer 10,000 shares
                     Meryl B. Witmer 0 shares

               (ii)  shared power to vote or to direct the vote:
                     Witmer Asset Management 1,071,216 shares
                     Charles H. Witmer 1,090,216 shares
                     Meryl B. Witmer 1,090,216 shares

              (iii)  sole power to dispose or to direct the disposition of:
                     Witmer Asset  Management 0 shares
                     Charles H. Witmer 10,000 shares
                     Meryl B. Witmer 0 shares

               (iv)  shared power to dispose or to direct the disposition of:
                     Witmer  Asset  Management 1,071,216 shares
                     Charles H. Witmer 1,090,216 shares
                     Meryl B. Witmer 1,090,216 shares

Item 5.   Ownership of Five Percent or Less of a Class

     If this  statement  is being  filed to report  the fact that as of the date
hereof the reporting  person has ceased to be the beneficial  owner of more than
five percent of the class of securities, check the following:   [ ]


Item 6.   Ownership of More than Five Percent on Behalf of Another Person

          Not Applicable

Item 7.   Identification and Classification of the Subsidiary Which Acquired the
          Security Being Reported on By the Parent Holding Company

          Not Applicable

Item 8.   Identification and Classification of Member of the Group

          Not Applicable

Item 9.   Notice of Dissolution of Group

          Not Applicable

Item 10.  Certification

          The  following  certification  shall be included if the  statement  is
          filed pursuant to ss.240.13d-1(c): By signing below I certify that, to
          the best of my knowledge and belief, the securities  referred to above
          were not  acquired  and are not held  for the  purpose  of or with the
          effect of  changing  or  influencing  the control of the issuer of the
          securities  and were not acquired and are not held in connection  with
          or as a participant in any transaction having that purpose or effect.

Exhibits  Exhibit 1
          ---------

          Joint Filing  Agreement  dated September 28, 2006 between Witmer Asset
          Management, Charles H. Witmer and Meryl B. Witmer.

CUSIP Number: 483007704


                                   SIGNATURES

     After  reasonable  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.


Dated:  September 28, 2006                  Witmer Asset Management

                                            /s/ Charles H. Witmer *
                                            -----------------------------
                                            Name: Charles H. Witmer
                                            Title: Managing Member


Dated:  September 28, 2006                  /s/ Charles H. Witmer *
                                            -----------------------------
                                            Charles H. Witmer


Dated:  September 28, 2006                  /s/ Meryl B. Witmer *
                                            -----------------------------
                                            Meryl B. Witmer


* The reporting  persons hereby  disclaim  beneficial  ownership over the shares
reported on this 13G except to the extent of their pecuniary interest therein.

CUSIP Number: 483007704


Exhibit 1
                             Joint Filing Statement

                     Statement Pursuant to Rule 13d-1(k)(1)


     The  undersigned  hereby  consent  and agree to file a joint  statement  on
Schedule 13G under the Securities Exchange Act of 1934, as amended, with respect
to shares of common stock of Kaiser Aluminum  Corporation  beneficially owned by
them, together with any or all amendments thereto, when and if appropriate.  The
parties hereto further consent and agree to file this Statement Pursuant to Rule
13d-1(k)(1)(iii)  as an exhibit to Schedule 13G, thereby  incorporating the same
into such Schedule 13G.




Dated:  September 28, 2006                  Witmer Asset Management

                                            /s/ Charles H. Witmer
                                            -----------------------------
                                            Name: Charles H. Witmer
                                            Title: Managing Member


Dated:  September 28, 2006                  /s/ Charles H. Witmer
                                            -----------------------------
                                            Charles H. Witmer


Dated:  September 28, 2006                  /s/ Meryl B. Witmer
                                            -----------------------------
                                            Meryl B. Witmer



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