Understand that I cannot see your private tax data, but let me make the following observations.
"the state estimated taxes due for the coming year" - estimate taxes are not due in the same way that tax is due when you file your return. The estimated tax forms that TurboTax prints out are just that, "estimated". In fact, you may be aware of circumstances in the coming year that could cause you to decide that you can reduce your quarterly payments or not have to make any payments at all.
TurboTax normally generates the estimated tax forms if it seems likely based on your current return that you will need to pay estimated taxes to avoid an underpayment penalty next year.
California says,
"Generally, you do not have to make estimated tax payments if the total of your California withholdings is 90% of your required annual payment. Also, you do not have to make estimated tax payments if you will pay enough through withholding to keep the amount you owe with your tax return under $500 ($250 if married/registered domestic partner (RDP) filing separately). "
Any chance that you were within $500 of the tax due this year or that your withholding was more than 90% of the tax due? That would explain not having estimated tax forms this year with your return.
If you decide that you want to make estimated tax payments, you can find the 540-ES forms at this California webpage.
Alternatively, you might look at the options to pay the CA FTB online.
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