Iowa Code § 306.37: Tender of damages.

No appeal from an award of damages shall delay the prosecution of the work when the amount of the award is tendered in writing to the claimant and such tender is kept good. An order to the auditor to issue warrants to claimants for damages shall constitute a valid tender, if funds are available to promptly meet such warrants. Acceptance of the amount of such tender bars an appeal. Should possession of the condemned premises be taken pending appeal and the final award be not paid, the county shall be liable for all damages caused during such possession.