S.D. Codified Laws § 55-3-27
Except as otherwise provided by the terms of the trust, if the value of the trust property of a noncharitable trust is less than one hundred fifty thousand dollars, the trustee may terminate the trust. On petition by a trustee or beneficiary, the court may modify or terminate a noncharitable trust or appoint a new trustee if it determines that the value of the trust property is insufficient to justify the cost of administration involved. Upon termination of a trust pursuant to this section, the trustee shall distribute the trust property in accordance with the trustor's probable intention. The existence of spendthrift or similar protective provisions in a trust does not make this section inapplicable. The court, when considering the termination of a trust containing spendthrift or similar protective provisions, shall consider the feasibility of appointing a new trustee to continue the trust. This section does not apply to a purpose trust under subdivision 55-1-21(1).
SDCL 55-3-27