Dr. Bernard C. Sherman appeals from an order of the district court denying his motion for release of bail funds and granting City National Bank’s motion to compel the Oregon district court clerk to comply with the bank’s writ of garnishment. The district court concluded that ownership of the bail funds, which were advanced by Sherman to secure the release of criminal defendant Harvey Rubenstein, had passed from Sherman to Rubenstein. Accordingly, the district court held that Rubenstein’s judgment creditor, City National Bank, was entitled to garnish bail funds remaining after Rubenstein paid restitution. Sherman challenges the district court’s ruling that he conveyed ownership of the bail funds to Rubenstein. We vacate the judgment of the district court and remand.
BACKGROUND
In 1985, Rubenstein was indicted for wire fraud in the District of Oregon. He was also indicted on similar charges in California. Following his arrest in August 1988, the district court in Oregon set bail at $25,000 on the California charges and $75,-000 on the Oregon charges.
On September 13, 1988, the Oregon district court received a $75,000 cashier’s check from Rubenstein’s attorney, David Audet. The following week, the court received a second cashier’s check from Audet *291 for $25,000. 1 On the same day, Rubenstein executed appearance bonds in the two cases, thereby securing his release. On the $75,000 bond, Rubenstein stated his net worth to be $75,000; on the $25,000 bond, $25,000. Neither appearance bond indicates a surety other than Rubenstein himself.
In January 1990, Rubenstein pleaded guilty to some of the pending charges. As part of his sentence, the district court required that $50,000 of the previously posted $100,000 in cash bonds be paid as restitution to three victims of Rubenstein’s fraud. This appeal concerns the disposition of the remaining $50,000 in bail funds. We therefore recount the source of this money, and its disposition in the lower court.
The two cashier’s checks totalling $100,-000 were payable to the district court clerk. They were drawn on the United States National Bank of Oregon, where Audet’s firm maintained its client trust fund account. Into this account Sherman had previously wired a total of $100,000 from his personal account in a Canadian bank. The wire transfers, one for $75,000 and one for $25,000, both indicate the client trust account of Audet’s firm to be the beneficiary of the transfers. The transfers state their purpose to be “Refer: H. Rubenstein.”
Sherman’s subsequently-declared purpose for advancing these funds was that Rubenstein owed him a large sum of money, that Rubenstein might eventually repay some of this debt, and that Sherman “couldn’t see any benefit, from [his] viewpoint, of having [Rubenstein] languish in jail.” Because Rubenstein had defrauded Sherman previously, Sherman claims he was only willing to advance the funds upon receiving Audet’s assurance that the money would be kept from Rubenstein, and that it would otherwise be protected. Au-det and Sherman have both disclaimed any intent to give or loan Rubenstein the money deposited as bail.
The only written instructions regarding the advances appear in two letters written by Audet to Sherman at the latter’s request. The letter of September 9, 1988 reads:
Dear Dr. Sherman:
I represent Mr. Rubenstein on pending federal charges in Portland, Oregon. His bail has been set at $75,000.00 U.S. cash. If you wire the $75,000.00 to my office’s client trust fund account, it will be posted as bail. When the case is concluded we will return the money to you.
The letter of September 29,1988, regarding the remaining $25,000, is substantially the same, concluding: “We will return the money to you when the case is concluded and the money is returned to us by the court.”
City National Bank began its attempts to garnish Rubenstein’s bail funds in October 1988 by filing in Multnomah County (Oregon) Circuit Court a judgment previously obtained against Rubenstein in California. The bank sought an order directing Ruben-stein and the federal district court clerk to show cause why a writ of attachment should not issue against the bail funds.
On December 1, 1988, the Oregon state court issued the requested order to show cause. At about the same time, Ruben-stein executed and filed with the district court clerk assignments purporting to transfer the deposited bail funds to Sherman. According to Audet and Sherman, the purpose of this assignment was to compensate for omitting Sherman’s name as Rubenstein’s surety at the time the bail funds were posted and generally to secure the deposited funds in Sherman’s name. Audet testified the assignments were not intended to suggest that Rubenstein actually had an interest in the funds. Indeed, Rubenstein himself disclaimed ever having an interest in the bail funds.
Shortly after these assignments were executed, the United States removed the garnishment proceeding to federal court. On December 13, 1988, the district court remanded the action for lack of federal juris *292 diction. 2 On remand, City National Bank prevailed in its efforts to obtain a writ of garnishment against the bail funds.
Rubenstein spent 1989 vacillating with regard to the federal criminal charges pending against him. In February he withdrew his not guilty plea and pleaded guilty. In June, he changed his plea again. In January 1990, he again pleaded guilty. Sometime during this period, Rubenstein learned that he might avoid a long prison sentence by making restitution to victims of his fraudulent schemes. Rubenstein then convinced Sherman in late 1989 to assign half of the deposited funds, $50,000, to the district court clerk solely for use in paying restitution on behalf of Rubenstein. Rubenstein also assigned to the district court clerk whatever interest he retained in the bail funds.
When Rubenstein was sentenced on March 23, 1990, he was ordered to pay restitution. To assure performance, the district court set aside $50,000 of the bail funds for distribution to Rubenstein’s victims. The court then turned its attention to City National Bank’s recently-filed motion to compel the district court clerk to comply with the bank’s newly-obtained writ of garnishment. Because ownership of the remaining $50,000 in bail funds was unclear, the district court instructed the bank to apply to the state court “for [a] determination of who the balance of the bail money belongs to.”
At this point, Sherman and City National Bank returned to state court, where Sherman filed a claim of exemption alleging that he, not Rubenstein, owned the bail funds. After a hearing, the state court denied Sherman’s claim and confirmed the bank’s writ of garnishment on the ground that Sherman had transferred ownership of the bail funds to Rubenstein. Despite this ruling, Sherman returned to federal court and filed a motion pursuant to 28 U.S.C. §§ 2041, 2042, and Fed.R.Crim.P. 46(f) seeking release of the remaining $50,000 in bail funds.
In a July 12, 1990, decision considering both Sherman’s motion and the motion of the bank to compel compliance with its writ of garnishment, the district court concluded that the Oregon state court was a proper forum in which to determine ownership of the funds and that the state court correctly concluded that Rubenstein, rather than Sherman, owned the bail funds. Sherman has timely appealed this decision of the district court. The district court’s order denying Sherman’s motion is an appeal-able collateral order.
See United States v. Badger,
DISCUSSION
I
This court has a special obligation to satisfy itself of the lower court’s jurisdiction.
Bender v. Williamsport Area Sch. Dist.,
In
United States v. Arnaiz,
*293
The parties do not dispute that Ru-benstein satisfied the conditions of the bonds he signed. Release of bail funds was therefore required by Fed.R.Crim.P. 46(f). To release the funds, it was necessary to determine to whom they should be released.
See Arnaiz,
II
A
In denying Sherman’s claim of exemption and confirming City National Bank’s writ of garnishment, the state court determined that Sherman transferred ownership of the bail funds to Rubenstein. It is uncertain, however, what role this determination played in the federal court’s denial of Sherman’s motion for release of the bail funds. For example, the district court reviewed the correctness of the state court’s factual determination. Such review is inconsistent with the application of collateral estoppel.
See University of Ill. Found. v. Blonder-Tongue Lab., Inc.,
Yet in sending the parties to state court, the federal trial court obviously foresaw a role for its counterpart in these proceedings. Cf. 28 U.S.C. § 636(b)(1) (providing for reference of matters by district courts to magistrate judges and for review of findings made on referral). We must therefore decide whether the state court finding can properly inform the federal court’s decision. We conclude that it cannot. 5
B
Federal courts have a “virtually unflagging obligation” to exercise the jurisdiction conferred upon them by the coordinate branches of government and duly invoked by litigants.
Colorado River Water Conservation Disk v. United States,
We view the district court’s order directing Sherman and the bank to litigate bail ownership in the state court garnishment proceeding as a decision to abstain under
Colorado River.
When a federal court believes an issue is better addressed by a state court and certification is not available, abstention is the alternative.
See Lehman Bros. v. Schein,
C
Several factors are relevant in deciding whether abstention under
Colorado River
is appropriate in a particular case.
See, e.g., id.
at 1408. Yet the decision whether to abstain “because of parallel state-court litigation does not rest on a mechanical checklist, but on a careful balancing of the important factors as they apply in a given case, with the balance heavily weighted in favor of the exercise of jurisdiction.”
Moses H. Cone Memorial Hosp.,
The district court gave no consideration to the
Colorado River
factors we think most important in this case. Chief among them is that the district court had previously assumed jurisdiction over the funds in question.
See Colorado River,
*295
Although we have said that “money ... is not the sort of tangible physical property referred to in
Colorado River," Travelers Indem. Co. v. Madonna,
The courts clearly have a deep interest in preserving the viability of the bail system in order to assure the attendance of criminal defendants at trial, and should be most reluctant to countenance interference with that system. Indeed, there is a civil liberties interest as well; when a third party comes to the aid of a defendant by posting bond on his behalf, the court has a duty to honor such trust.
Badger,
We also think it important that the motion pending before the district court at the time it decided to abstain — ie., the bank’s motion to compel compliance with the writ of garnishment — did not in fact implicate the writ of garnishment issued by the state court. Having chosen a state forum in which to obtain the writ, the bank should have followed that court’s procedures in the event the clerk refused to comply with the writ. See Or.Rev.Stat. § 29.285 (1991) (concerning examination and punishment of a recalcitrant garnishee). With the possible exceptions of granting permission to garnish and of hearing the case on removal, we see no role for the federal district court in the ordinary course of state garnishment proceedings. 7
Rather than implicating the state garnishment proceeding, the motions of both City National Bank and Sherman invoked the separate power of the district court over funds in its registry. 8 There is nothing about the federal proceeding that necessitated a state court determination of ownership of the funds. Accordingly, we conclude the district court abused its discretion by staying its hand and returning the parties to state court to litigate Sherman’s claim. Because the parties are entitled to adjudication of the issue in federal court without regard to the state garnishment proceeding, we remand to the district court for an independent determination of who owns the bail funds.
Ill
Although the district court relied on the state court’s findings to some extent, it also made its own findings of fact and conclusions of law. We will review these here to guide the district court on remand.
Contrary to dicta appearing in
United States v. Widen,
In the present case, there is no dispute that Sherman was the source of Ruben-stein’s bail. The question, then, is whether Rubenstein acquired ownership of the funds. Unless a transfer of ownership occurred, the $50,000 in question should be released to Sherman and City National Bank’s motion to enforce its writ of garnishment should be denied. 9
We have found only three federal cases that consider whether ownership of monies posted as bail in a federal criminal proceeding transferred from a third party to the defendant.
10
In
United States v. Parr,
Clinton Manges posted $75,000 with the district court clerk as bail for the defendant Parr.
In
Jacobson v. Hahn,
Finally, in
Neely v. United States,
*297 The Neely court concluded that Neely had intended neither a gift nor a loan in posting Sanzone’s bail. Id. at 716, 717-18. The court noted that Neely’s attorney “sought a receipt for the monies so that upon the satisfaction of the bond the fund would be returned to Birnbaum as agent for plaintiff.” Id. at 718. Thus, the government was ordered to return to Neely the monies on which it had levied. Id.
In the present case, the district court relied on five facts to find that Rubenstein acquired ownership in the bail funds advanced by Sherman: (1) Sherman wired the cash “to defendant solely with the instruction remittance to ‘H. Rubenstein’ (2) Rubenstein “acted as his own surety when he signed the cash appearance bonds”; (3) Rubenstein “made no disclosure that the bail monies were not his as required by Fed.R.Crim.P. 46”; (4) Rubenstein “represented to the court that his net worth to-talled $100,000, the amount of the bail money deposited”; and (5) defendant purported to assign the bail money to Sherman at the time City National Bank filed its writ of garnishment.
These purported facts are mostly flawed or irrelevant. First, when Sherman wired the funds, he sent them not to Rubenstein himself, but to the client trust fund account for the law firm of Rubenstein’s attorney. Rubenstein never had access to the funds. Significantly, Rubenstein’s name appears on the wire transfers not under the “Beneficiary” heading but under the heading of “Purpose of Remittance.” Moreover, contrary to the finding of the district court, Sherman did convey instructions to Attorney Audet concerning use of the funds. These instructions were oral and were memorialized at Sherman’s request in the letters Audet sent to Sherman.
Second, to state that Rubenstein “acted as his own surety” begs the question of ownership of the bail funds. Furthermore, it is incongruous to say that Rubenstein acted as a surety when the bonds were indicated to be “non-surety.”
Third, failure to disclose the source of bail funds has not previously been found fatal to a claim for release of such funds.
See Neely,
Fourth, Rubenstein did not claim outright that his net worth was $100,000. Instead, he indicated his net worth on the $75,000 bond to be $75,000; on the $25,000 bond, $25,000. Because these statements of net worth were made on the same day, they are almost certainly inconsistent. Beyond indicating that Rubenstein did not understand the forms he was filling out, these statements are meaningless.
Finally, we agree with the district court that Rubenstein’s purported assignment of the bail funds to Sherman lends support to the finding that Sherman had initially conveyed title in the bail funds to Rubenstein. 11 However, reliance on this evidence alone would not justify a finding for the bank, in view of substantial evidence to the contrary.
For example, there is direct evidence concerning Sherman’s intent in advancing the funds.
12
The testimony of Sherman and Audet is strong evidence of the “intention of all concerned.”
Parr,
As this case now stands, it appears virtually on all fours with
Neely.
Indeed, the present case may be stronger, given the memorialization of Sherman’s instructions to Audet. The one distinction between the two cases is that, in the present case, Sherman delivered the funds to Rubenstein’s attorney.
Cf.
CONCLUSION
The parties should not have been returned to state court to litigate the question of the bail funds’ ownership. In preparation for an independent determination of ownership by the district court, we have reviewed the relevant law and evidence developed thus far. We now remand for further proceedings consistent with this opinion.
VACATED and REMANDED.
Notes
. Receipts for both checks indicate the checks were received only from "Rieke, Geil & Savage — David Audet, Attorney.”
. The propriety of the remand order is not before us on this appeal.
.
Amaiz
impliedly rejects the holding of
United States v. Widen,
. The absence of a federal tax lien against the bail funds distinguishes the present case from
United States
v.
Badger.
In that case, we ruled on a "narrow jurisdictional issue” and held that under the Anti-Injunction Act the district court lacked power to settle a dispute as to who owned bail funds when one claim took the form of an IRS levy.
. We arrive at this conclusion on a ground other than the ability of a party to institute state court proceedings for the purpose of garnishing bail funds held in the registry of a federal district court. Apart from the question of whether Ru-benstein owned the funds, the parties do not now dispute the validity of City National Bank’s writ of garnishment. As we recently observed, however, "funds in the registries of federal courts are not, as a general rule, subject to writs of attachment or garnishment.”
United States v. Van Cauwenberghe,
. We need not consider whether another court could exercise authority over federal registry funds.
Cf. Landau,
. We note that the bank did not seek federal enforcement under 28 U.S.C. § 1738 of either the Oregon writ of garnishment or the California judgment.
. To the extent that the State of Oregon’s inter- ’ est in its writ of garnishment remains a consideration, the interest here is not in enforcing a judgment of an Oregon court.
Cf. Pennzoil Co. v. Texaco, Inc.,
. Because the issue in this case concerns ownership of the funds, the parties’ references to secured and unsecured interests in the bail monies are irrelevant. Sherman makes no argument that, even if he lost title to the funds, his remaining interest in the funds was superior to the bank's.
. A fourth federal case,
Midland Ins. Co. v. Friedgood,
. Even so, Audet explained that the assignment was included solely to protect Sherman by making clear that Rubenstein had no claim to the funds. Furthermore, although Sherman’s 1989 assignment of half of the bail funds to the district court clerk is consistent with the purported reassignment of the bail funds by Ruben-stein to Sherman, it is equally consistent with the conclusion that Sherman had retained title to the funds all along.
. Contrary to the assertions of City National Bank, Sherman’s intent in transferring the funds is most important. The bank’s reference *298 to its own objective, good faith belief as to who owned the bail funds is irrelevant in the present context. The facts do not disclose that the bank took possession of the garnished funds, with or without knowledge of Sherman’s claim.
. Consistent with the view that Audet served as Sherman's agent with regard to the bail funds is the fact that the receipt for the money issued by the district court clerk to Audet was in Audet's name alone, "so that upon the satisfaction of the bond the fund would be returned to [Audet] as agent for [Sherman].”
Neely,
