WASHINGTON, D.C. 20549

Date of Report (Date of Earliest Event Reported):		September 6, 2007

(Exact name of registrant as specified in its charter)

Nevada		000-22494		880304799
(State or other jurisdiction of incorporation)		(Commission File Number)		(I.R.S. Employer Identification No.)

3773 Howard Hughes Parkway, Suite 490S, Las Vegas, Nevada		89169
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code:		(702) 567-7000

Former name or former address, if changed since last report

On September 6, 2007, Ameristar Casinos, Inc. (“ACI”) entered into a Second Amendment to Credit Agreement, dated as of August 31, 2007 (the “Second Amendment”), to amend the Credit Agreement, dated as of November 10, 2005, as previously amended by a First Amendment to Credit Agreement, dated as of August 21, 2006 (the “Credit Agreement”), among ACI, the various lenders party to the Credit Agreement and Deutsche Bank Trust Company Americas, as Administrative Agent. Pursuant to the Second Amendment: (i) Section 1.14(a) of the Credit Agreement was amended to increase the amount of permitted incremental loan commitments from $400,000,000 to $600,000,000; (ii) Section 8.13(a) of the Credit Agreement was amended to permit ACI or its subsidiary to acquire RIH Acquisitions IN, LLC, which owns and operates the Resorts East Chicago casino and hotel in East Chicago, Indiana, for an amount (including related transaction costs and expenses) not to exceed $700,000,000, without reducing the amount ACI is permitted to spend for other permitted acquisitions; (iii) Sections 9.08 and 9.09 of the Credit Agreement were amended to make certain increases in the maximum permitted Leverage Ratio and Senior Leverage Ratio, respectively for ACI’s fiscal quarters ending on and after September 30, 2007; (iv) Section 11.01 of the Credit Agreement was amended to increase the Applicable Margin (i.e., the interest rate add-on) for ACI’s outstanding Term Loan by 50 basis points (i.e., to 2.0% in the case of Eurodollar Loans and to 1.0% in the case of Base Rate Loans); and (v) Section 11.01 of the Credit Agreement was further amended to change the definition of “Neilsen Family Group” in certain respects (this term is used in determining whether a Change of Control of ACI has occurred). ACI paid to each Lender which approved the Second Amendment a one-time cash amendment fee of 12.5 basis points of the Lender’s outstanding Term Loan and/or Revolving Loan Commitment.

The Second Amendment is filed as Exhibit 4.1 to this Current Report.

Item 2.03.		Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information set forth under Item 1.01 of this Current Report is hereby incorporated by reference in response to this Item 2.03.

Item 9.01 Financial Statements and Exhibits.

Exhibit		Description
4.1		Second Amendment to Credit Agreement, dated as of August 31, 2007, among the Registrant, the various leaders party thereto and Deutsche Bank Trust Company Americas, as Administrative Agent.

Exhibit		Description
4.1		Second Amendment to Credit Agreement, dated as of August 31, 2007, among the Registrant, the various leaders party thereto and Deutsche Bank Trust Company Americas, as Administrative Agent.