FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Sauder David R   2. Issuer Name and Ticker or Trading Symbol FOSTER L B CO [FSTR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Vice President-Business Dev (Last) (First) (Middle) 415 HOLIDAY DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 03/15/2011 (Street) PITTSBURGH, PA 15220 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock               4,507 (2) D   Common Stock               754 (3) D   Common Stock               595 (4) D   Common 03/15/2011   A   621 (7) A (1) 621 (7) D   Common 03/15/2011   A   1,500 (10) A (1) 1,500 (10) D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Underlying Securities (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Performance Share Units	(5)							(5)	(5)	N/A (5)	(5)		2,262 (5)	D
Performance Share Units	(6)							(6)	(6)	N/A (6)	(6)		1,747 (6)	D
Performance Share Units	(1)	03/15/2011		A		1,863 (8)		(1)	(1)	Common	(1)	(1)	1,863 (8)	D
Special Performance Share Units	(1)	03/15/2011		A		1,000 (9)		(1)	(1)	Common	(1)	(1)	1,000 (9)	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Sauder David R 415 HOLIDAY DRIVE PITTSBURGH, PA 15220			Vice President-Business Dev

Signatures

/s/ David R. Sauder		03/17/2011
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Not applicable.
(2)	3,333 shares not vested and non-voting until November 3, 2011.
(3)	Not vested and non-voting until March 3, 2013.
(4)	Not vested and non-voting until March 3, 2014.
(5)	(0 - 4524). Performance share units will convert into common stock based on Company's performance against financial metric for calendar year 2009-2011, inclusive. Stock awarded shall range from 0 - 2 for each performance unit.
(6)	(0 - 3494 shares). Performance share units will convert into common stock based on Company's performance against financial metric for calendar year 2010 - 2012, inclusive. Stock awarded shall range from 0 - 2 for each performance unit.
(7)	Not vested until March 15, 2015.
(8)	(0 - 3726 shares). Performance share units will convert into common stock based on Company's performance against financial metric for calendar year 2011-2013, inclusive. Stock awarded shall range from 0-2 for each performance share unit.
(9)	(0 - 2000 shares). Special Performance Share Units will convert into common stock based on subsidiary performance against financial metric in 2011. Stock award shall range from 0-2 for each performance share unit.
(10)	Not vested until, 25% on March 15, 2012, 25% on March 15, 2013, 25% on March 15, 2014 and 25% on March 15, 2015.

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