United States
Securities and Exchange Commission
Washington, D.C. 20549

Under the Securities Exchange Act of 1934

(Name of Issuer): Dawson Geophysical  Co.

(Title of Class of Securities): Common Stock

(CUSIP Number): 239359102

(Date of event which requires filing of this Statement): 05/05/2011

Check the appropriate box to designate the Rule pursuant to which this schedule
is filed:
[X] Rule 13d-1(b)
[ ] Rule l3d-1(c)
[ ] Rule l3d-1(d)

* The remainder of this cover page shall be filled out for a reporting person's
initial filing of this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
The information required in 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 No. N/A
(1) Names of Reporting Persons: Columbia Partners, LLC Investment Management

(2) Check the Appropriate Box if a Member of a Group (See Instructions)
    (a) N/A
    (b) N/A

(3) SEC Use Only

(4) Citizenship or Place of Organization: United States

Number of Shares Beneficially Owned By Each Reporting Person With:

(5) Sole Voting Power: N/A
(6) Shared Voting Power: N/A
(7) Sole Dispositive Power: 443,355
(8) Shared Dispositive Power: N/A

(9) Aggregate Amount Beneficially Owned by Each Reporting Person: 443,355

(10) Check if the Aggregate Amount in Row(9) Excludes Certain Shares: N/A

(11) Percent of Class Represented by Amount in Row(9): 5.61%

(12) Type of Reporting Person (See Instructions): IA


SCHEDULE 13G
Item 1(a). Name of Issuer: Dawson Geophysical Co.

Item 1(b). Address of Issuer's Principal Executive Offices:
508 West Wall
Midland, TX 79701

Item 2(a). Name of Person Filing: Columbia Partners, LLC Investment Management

Item 2(b). Address of Principal Business Office or, if none, Residence:
Columbia Partners, LLC Investment Management
5425 Wisconsin Avenue,  Suite 700
Chevy Chase, MD 20815

Item 2(c). Citizenship: Columbia Partners, LLC Investment Management was
incorporated and organized in the state of Delaware, in the United States.

Item 2(d). Title of Class of Securities: Common Stock

Item 2(e). CUSIP No.: N/A

Item 3. If this statement is filed pursuant to Rule 13d-l (b) or 13d-2(b),
check whether the person filing is a:

(a) [ ] Broker or Dealer registered under Section 15 of the Act
(d) [ ] Investment Company registered under Section 8 of the Investment Company
Act
(e) [X] Investment Adviser in accordance with 240.13d-1(b) (1)(ii)(E)

Item 4. Ownership:

Number of Shares: 443,355
Percentage of Outstanding Shares: 5.61%
Sole Voting Power: N/A
Shared Voting Power: N/A
Sole Dispositive Power: 443,355
Shared Dispositive Power: N/A

Item 5. Ownership of Five Percent or Less of a Class: N/A

Item 6. Ownership of More than Five Percent on Behalf of Another Person: N/A

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

Item 8. Identification and Classification of Members of the Group: N/A

Item 9. Notice of Dissolution of Group: N/A

Item 10. Certification

By signing below, I certify that, to the best of my knowledge and belief, the
Securities referred to above were acquired in the ordinary course of business
and were not acquired for the purpose of and do not have the effect of changing
or influencing the control of the issuer of such securities and were not
acquired in connection with or as a participant in any transaction having such
purposes or effect.

SIGNATURE

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

By: /s/ K. Dunlop Scott
Name: K. Dunlop Scott
Title:  Chief Compliance Officer
Date: 05/10/2011