Defendant-appellant, Wilson Ben Jones, pled guilty to three counts of involuntary manslaughter, in violation of 18 U.S.C. §§ 1112(a) and 1153, and the district court sentenced him to 71 months imprisonment. Jones filed a timely notice of appeal on October 11, 2002. We exercise jurisdiction pursuant to 28 U.S.C. § 1291 and AFFIRM.
I. Background
Jones’ three convictions stem from an alcohol-related accident on the Ute Mountain Indian Reservation on December 8, 2001, in which Rufus Cayaditto, his common-law wife, Latanyia Begay, and then-infant child, Jasmyne Cayaditto, lost then-lives. While driving a 1988 Ford Bronco II on Colorado Highway 160, Jones crossed the center line and collided head on with the victims’ Dodge sedan. At the time of the accident, Jones’ blood-alcohol level was .266, over twice the legal limit. Jones pled guilty to three counts of involuntary manslaughter under 18 U.S.C. § 1112.
At sentencing, the district court determined Jones’ adjusted offense level as follows. First, the district court concluded that Jones’ conduct was “reckless” under *1298§ 2A1.4 and set his base offense level at 14. Second, the court added three offense levels under § 3D1.2, to account for the multiple counts of conviction, bringing the adjusted offense level to 17. Finally, the district court decreased Jones’ offense level by three levels, pursuant to the acceptance-of-responsibility provision, § 3E1.1. This resulted in an adjusted base offense level of 14.
The Presentencing Report (“PSR”) recommended a nine-level upward departure in offense level and the imposition of the statutory maximum of 72 months imprisonment.1 In support of the PSR, the government filed a Motion for Upward Departure in which it also recommended a nine-level upward departure.2
The district court agreed that an upward departure for offense level was appropriate, but it did not adopt the recommended departure or the methodology set forth in either the PSR or the government’s motion. Instead, the district court departed upward seven levels, bringing the offense level to 21. The district court arrived at this conclusion, based on the following allocation:
Factor3 Increase to offense level
Significant danger to public safety created by Jones’ conduct
Multiple deaths within a single family unit
Extreme recklessness of Jones’ conduct
Total
The district court then increased Jones’ criminal-history category from II to IV, based on his five prior drunk-driving convictions.4
The district court imposed a sentence of 71 months for each count, to be served concurrently, which was within the guideline range for offense level 21 and criminal-history category IV. This appeal followed.
II. Discussion
In this case, the sole question we must consider is whether the district court erred in concluding that Jones’ conduct fell outside the “heartland” of involuntary manslaughter cases sufficient to support a seven-level upward departure in offense level under the Sentencing Guidelines. For the reasons set forth below, we affirm the district court’s sentencing determination.
*1299A. Standard of Review and Overview of Applicable Law
In criminal cases other than child crimes and sex offenses, a sentencing court may depart from the applicable guideline range if “the court finds that there exists an aggravating or mitigating circumstance of a kind, or to a degree, not adequately taken into consideration by the Sentencing Commission in formulating the guidelines.” 18 U.S.C. § 3553(b)(1) (emphasis added). In reviewing a district court’s sentencing determination, we accept the district court’s findings of fact unless clearly erroneous. 18 U.S.C. § 3742(e). Further, we generally “give due deference to the district court’s application of the guidelines to the facts.” Id. Where the district court departs from the sentencing guidelines, however, we review de novo the district court’s determinations under 18 U.S.C. § 3742(e)(3)(A) and (B). Id.
Application of the de novo standard of review in sentencing-departure cases represents a shift from our earlier case law. Prior to the enactment of the Prosecutorial Remedies and Tools Against the Exploitation of Children Today Act of 2003 (“PROTECT Act”), Pub.L. No. 108-21, 117 Stat. 650, we reviewed sentencing departures under a “unitary abuse of discretion standard,” applying the four-part test, set forth in United States v. Collins, 122 F.3d 1297, 1302-03 (10th Cir.1997). The amendments contained in the PROTECT Act5 modify the unitary abuse of discretion standard; the applicable analytical framework, however, remains generally consistent with the four-part test set forth in Collins.
In light of the PROTECT Act’s amendments, our review of the district court’s sentencing departure shall proceed as follows. First, we must ascertain whether the district court set forth, in a written order of judgment,- its specific reasons for departure. 18' U.S.C. § 3742(e)(3)(A); 18 U.S.C. § 3553(c)(2). Second, we must consider whether the factors the district court relied upon “advance the objectives set forth in section 3553(a)(2),”6 18 U.S.C. § 3742(e)(3)(B)(i), and ensure that the district court’s reliance on those factors did not violate any specific prohibition in the Guidelines, Koon v. United States, 518 U.S. 81, 106, 116 S.Ct. 2035, 135 L.Ed.2d 392 (1996). Our review under this second prong of the analysis is de novo. 18 U.S.C. § 3742(e)7; Collins, 122 F.3d at 1302-03. Third, we must consider whether the factors the dis*1300trict court relied upon were “authorized under section 3553(b)”8 and “justified by the facts of the case.” 18 U.S.C. § 3742(e)(3)(B)(ii)-(iii). To determine whether the factors are “authorized,” we look to 18 U.S.C. § 3553(b)(1), which provides that a district court may depart if “there exists an aggravating or mitigating circumstance of a kind, or to a degree, not adequately taken into consideration by the Sentencing Commission in formulating the guidelines.” This third step in the analysis is commonly called the “heartland” determination. See Collins, 122 F.3d at 1303 (reviewing court must determine “whether the departure factors relied upon by the district court remove the defendant from the applicable Guideline heartland [sufficient to] warrant! ] a departure”). We review de novo this “application of the guidelines to the facts” under 18 U.S.C. § 3742(e)(3)(B).9 See 18 U.S.C. § 3742(e). Finally, we must ask whether the district court’s sentence “departs to an unreasonable degree from the applicable guidelines range.” 18 U.S.C. § 3742(e)(3)(C); accord Collins, 122 F.3d at 1303 (reviewing court must determine “whether the degree of departure is reasonable”). In reviewing the degree of departure, we give due deference to the district court, 18 U.S.C. § 3742(e), and will not reverse absent an abuse of discretion. United States v. Goldberg, 295 F.3d 1133, 1138, 1141 (10th Cir.2002).
We proceed to consider the district court’s sentence in this case, in light of the preceding framework.
B. Analysis
1. Whether the district court stated its reasons for departure “with specificity. ”
Under 18 U.S.C. § 3553(c)(2), a district court must set forth, in a written order of judgment, its reasons for departure “with specificity.” 18 U.S.C. § 3553(c)(2). In this case, in its October 8, 2002, judgment, the district court concluded that Jones’ conduct fell outside the “heartland” of involuntary manslaughter cases sufficient to warrant an upward departure. The district court based its conclusion on the following three factors: (1) the significant danger to public safety created by Jones’ conduct, pursuant to U.S.S.G. § 5K2.14; (2) the multiple deaths, all within a single family, that resulted from Jones’ criminal conduct, pursuant to the background commentary to U.S.S.G. § 3D1.4; and (3) the “extreme” reckless*1301ness of Jones’ conduct. Thus, the district court satisfied section 3553(e)(2)’s requirement of a written order and judgment setting forth the specific reasons for departure.
2. Whether the district court relied on impermissible factors in concluding that Jones’ conduct fell outside the heartland of involuntary manslaughter cases.
In determining whether to depart from the Sentencing Guidelines, a district court must determine whether the case falls within the “heartland” of cases embodying the conduct contemplated by each guideline, or whether some aggravating or mitigating circumstance renders the case atypical or “unusual.” United States v. Whiteskunk, 162 F.3d 1244, 1248 (10th Cir.1998) (citing Koon v. United States, 518 U.S. 81, 93, 116 S.Ct. 2035, 135 L.Ed.2d 392 (1996)). As the Supreme Court noted in Koon:
The Guidelines ... “place essentially no limit on the number of potential factors that may warrant a departure.” The Commission set forth factors courts may not consider under any circumstances but made clear that with those exceptions, it “does not intend to limit the kinds of factors, whether or not mentioned anywhere else in the guidelines, that could constitute grounds for departure in an unusual case.”
518 U.S. at 106, 116 S.Ct. 2035 (emphasis added) (citation omitted). In addition to the restrictions set forth in the Guidelines, •we must also consider whether the factors the district court relied upon “advance the objectives set forth in section 3553(a)(2).” 18 U.S.C. § 3742(e)(3)(B)®.
With this in mind, we proceed to consider the three factors the district court relied upon in making its heartland determination.
a. The district court’s factors advance the objectives set forth in section 3553(a)(2) and do not violate any restriction set forth in the Guidelines.
First, with respect to the district court’s reliance on the significant danger to public safety created by Jones’ conduct, U.S.S.G. § 5K2.14 specifically provides that if “[public] safety was significantly endangered [by the defendant’s conduct], the court may increase the sentence above the guideline range to reflect the nature and circumstances of the offense.” Consistent with section 5K2.14, we have previously recognized that, in determining whether a case falls within the heartland of involuntary manslaughter cases, a district court may properly consider the “degree” of danger to public safety created by the defendant’s conduct. Whiteskunk, 162 F.3d at 1251-52. The degree of danger reflects on the “seriousness” of the offense, in accordance with 18 U.S.C. § 3553(a)(2)(A).
Second, with respect to the “extreme” recklessness exhibited by Jones’ conduct, we held in Whiteskunk that a sentencing court may properly consider the “varying degrees of recklessness” in making its heartland determination.10 See *1302162 F.3d at 1251-52. Indeed, “[a]n extra measure of criminal depravity is precisely the type of factual circumstance the departure mechanism is designed to address,” United States v. Smith, 133 F.3d 737, 751 (10th Cir.1997), inasmuch as the degree of recklessness bears heavily on the “seriousness” of the offense, accord 18 U.S.C. § 3553(a)(2)(A).
Further, in Whiteskunk, we expressly sanctioned the district court’s reliance on the defendant’s blood-alcohol level and pri- or conviction for drunk driving in considering the “degree” of recklessness exhibited by the defendant’s conduct. 162 F.3d at 1252. In this case, as in Whiteskunk, Jones’ blood-alcohol level was more than twice the legal limit.11 In addition, Jones had five previous drunk-driving convictions, putting him “on notice of [his] propensity to drink and drive and the dangerousness of such conduct.” Id. at 1252-53; accord id. at 1251 n. 2 (citing cases). Thus, the district court properly considered these two specific facts in concluding that Jones’ conduct exhibited “extreme” recklessness and created a significant danger to public safety.
Finally, we consider the district court’s third basis for departure: the multiple deaths, all within a single family, that resulted from Jones’ criminal conduct. We have previously noted, in dicta, that “[mjultiple deaths resulting from [a] defendant’s conduct ... presents a permissible ground for departure from the standard involuntary manslaughter Guideline range.” Whiteskunk, 162 F.3d at 1250; cf. U.S.S.G. § 5K2.1 (recognizing “multiple deaths” as an appropriate factor). In this case, however, Jones was convicted on three separate counts for the three deaths that resulted from his conduct, and the district court considered these counts in determining Jones’ adjusted offense level. Thus, the fact that multiple deaths occurred, standing alone, cannot support the district court’s decision to depart in this case.
The district court concluded, however, that, in killing a mother, father, and infant child, Jones’ conduct was “extraordinary,” and that “the multiple counts attributed to the [three] deaths ... do[ ] not contemplate the tragedy that occurred here.” As the district court noted, “[t]he normal tragedy of multiple deaths was worsened by the complete elimination of one branch of [two] different families.” We find the district court’s reasoning persuasive. Cf. U.S.S.G. § 3D1.4 (recognizing that, in “unusual circumstances,” the Guidelines’ approach for determining the base offense level for multiple counts “could produce adjustments for the additional counts that are inadequate”). Thus, we hold that the district court properly considered the “unusual circumstance” of killing an entire family in making its heartland determination. Accord 18 U.S.C. § 3553(a)(2)(A) (noting the need for the sentence imposed “to provide just punishment”).
*1303b. The district court did not engage in impermissible “double counting’’ in basing its decision to depart vertically, in pari, on Jones’ prior drunk-driving convictions.
Jones argues, however, that the district court engaged in impermissible “double counting,” insofar as the district court increased his criminal-history score based on his prior criminal convictions and increased his offense level, based, in part, on his prior criminal convictions for drunk driving. We disagree.
We have previously held that a district court may consider prior criminal convictions in determining both the appropriate criminal-history level and offense level under the Sentencing Guidelines. United States v. Alessandroni, 982 F.2d 419, 423 (10th Cir.1992). In reaching this conclusion, we focused on the distinct purposes furthered by the two categories. Id. ‘Whereas the offense level reflects the seriousness of the offense, the criminal history score reflects an assessment of the individual and the need to increase the sentence incrementally to deter the defendant from further criminal activity.”12 Id.; see also United States v. Campbell, 967 F.2d 20, 24 (2d Cir.1992) (“[I]t may be appropriate to count a single factor both in assessing the defendant’s criminal history category and in calculating the applicable offense level since the two measure different things.”).
We recognize that Alessandroni is distinguishable from the instant case, in that the court in Alessandroni found that Congress expressly provided for consideration of the prior felony conviction in both the criminal-history category and the offense-level calculation.13 Nevertheless, the court’s rationale is equally applicable to the district court’s “dual use” in the present case. Under Alessandroni, a prior criminal conviction is relevant in determin*1304ing the proper criminal-history category, insofar as it bears on the likelihood of recidivism, and it is also relevant, in certain circumstances, in determining the “seriousness of the offense,” 982 F.2d at 423, for example, as it relates to the defendant’s scienter, see Whiteskunk, 162 F.3d at 1252-53.
Here, the district court found that “[Jones’] conduct was excessively reckless and so disrespectful of human life that [it] approache[d][a] deliberate or intentional act[ ].” Thus, with respect to the district court’s use of Jones’ prior criminal convictions in determining the appropriate offense level, the district court relied on Jones’ prior drunk-driving convictions as evidence of the deliberateness of his conduct.14 As in Whiteskunk, Jones’ five previous drunk-driving convictions placed him “on notice of [his] propensity to drink and drive and the dangerousness of such conduct.” Id. at 1252-53. Accordingly, the district court logically concluded that Jones’ prior drunk-driving convictions increased the “seriousness of the offense.” 18 U.S.C. § 3553(a)(2)(A); see Alessandroni, 982 F.2d at 423.
Based on the above, we reject Jones’ contention that the district court’s reliance on his prior criminal convictions in deciding to depart vertically constituted impermissible “double counting.” 15
c. Summary
In conclusion, all three factors the district court relied upon were permissible, insofar as the factors advanced the objec-fives set forth in 18 U.S.C. § 3553(a)(2), see 18 U.S.C. § 3742(e)(3)(B)®, and did not run afoul of any specific prohibition in the Guidelines, Koon, 518 U.S. at 106, 116 S.Ct. 2035.
3. Whether the district court erred in concluding that, based on the aforementioned factors, Jones’ conduct fell outside the heartland of involuntary manslaughter cases.
We must next consider whether the factors the district court relied upon in making its heartland determination were “authorized under section 3553(b)” and “justified by the facts of the case.” 18 U.S.C. § 3742(e)(3)(B)(ii)-(iii). Under 18 U.S.C. § 3553(b)(1), a district court may depart if “there exists an aggravating or mitigating circumstance of a kind, or to a degree, not adequately taken into consideration by the Sentencing Commission in formulating the guidelines.”
In this case, the district court concluded that Jones’ case was outside the heartland of involuntary manslaughter cases, based on the factors discussed in section II.B.l, supra. In reaching its conclusion, the district court relied on the factual similarity between the present case and Whiteskunk, a prior Tenth Circuit case in which we upheld the district court’s decision to depart. Based on Whiteskunk, we agree with the district court that the “departure factors ... remove[d] [Jones’ conduct] from the applicable Guideline heartland [sufficient to] warrantf ] a departure.” Collins, 122 F.3d at 1303. Thus, the dis*1305trict court based its departure determination on factors “authorized under section 3553(b).” 18 U.S.C. § 3742(e)(3)(B)(ii). Further, the factors the district court relied upon were “justified by the,facts of the case.” Id. § 3742(e)(3)(B)(iii).
4. Whether the district court’s degree of departure was reasonable.
Finally, we must consider whether the district court’s sentence “departed] to an unreasonable degree from the applicable guidelines range.” 18 U.S.C. § 3742(e)(3)(C). “In determining whether the degree of departure is reasonable ..., ‘the appellate court should afford the trial court some discretion, as we should not lightly overturn determinations of the appropriate degree of departure.’ ” Goldberg, 295 F.3d at 1138 (quoting United States v. Flinn, 987 F.2d 1497, 1504 (10th Cir.1993)). In reviewing the reasonableness of the district court’s degree of departure, we consider the following factors: “ ‘the seriousness of the offense, the need for just punishment, deterrence, protection of the public, correctional treatment, the sentencing pattern of the Guidelines, the policy statements contained in the Guidelines, and the need to avoid unwarranted sentencing disparities.’ ” Collins, 122 F.3d at 1308-09 (quoting United States v. White, 893 F.2d 276, 278 (10th Cir.1990)) (citing 18 U.S.C. § 3742(e) and 18 U.S.C. § 3553(a)). As we noted in United States v. Jackson:
Although formulas of mathematical exactitude are neither required nor possible, the district court should articulate the objective criteria used as a basis for determining the actual sentence imposed. In many instances, this will consist of an extension -of or extrapolation from other guideline levels or principles, or use of an analogy to other closely related conduct or circumstances that are addressed by the guidelines.
921 F.2d 985, 990-91 (10th Cir.1990).
In this case, the district court departed upward one level based on the significant danger to public safety created by Jones’ conduct. As the district court’s degree of departure — one level — represents the minimum upward departure the court could have imposed, and in light of the Guidelines’ express sanction of this departure factor, see U.S.S.G. § 5K2.14, we find that the district court’s departure was reasonable.16 With respect to the upward departure for the multiple deaths within a single family unit, we reach the same conclusion. See U.S.S.G. § 3D1.4 (recognizing that, in “unusual circumstances,” the Guidelines’ approach for determining the base offense level for multiple counts “could produce adjustments for the additional counts that are inadequate”); cf. U.S.S.G, § 5K2.1 (recognizing “multiple deaths” as an appropriate departure factor).
Regarding the five-level upward departure for the “extreme” recklessness of Jones’ conduct, however, we have some concerns with the district court’s analogy to brandishing a firearm under U.S.S.G. § 2B3.1. Although “[a] sentence imposed based upon either extrapolation or analogy from the guidelines will ordinarily meet the requirements of proportionality and uniformity,” United States v. Kalady, 941 F.2d 1090, 1101 (10th Cir.1991), we have indicated that the methodology must be “ ‘reasonable,’ ” Collins, 122 F.3d at 1309.
*1306The provision upon which the district court relied, section 2B3.1, distinguishes between a “firearm” and other types of “dangerous weapon[s].” Thus, even assuming17 that the district court’s reliance on section 2B3.1 was appropriate in this context, the district court, in analogizing a drunk driver in a Ford Bronco to a “firearm,” as opposed to a “dangerous weapon,” proceeded in direct contravention of the Guidelines’ express language. See Kalady, 941 F.2d at 1101 (“[T]he task of ... the sentencing court ... is to attempt to predict what the Sentencing Commission would have established as a guideline range had it adequately considered the circumstances justifying the departure.”). Thus, in relying on section 2B3.1, the district court should have, at most, imposed a four-level increase (based on the use of a “dangerous weapon”), rather than a five-level increase.
That said, “we do not impose [the use of an analogy] as a mechanical formula.” Jackson, 921 F.2d at 993. Further, under Williams v. United States, we should not remand if we are satisfied, as we are, that the district court would have imposed the same sentence had it not relied upon the improper analogy. 503 U.S. 193, 203-04, 112 S.Ct. 1112, 117 L.Ed.2d 341 (1992). “A sentence ... can be ‘reasonable’ even if some of the reasons given by the district court to justify the departure from the presumptive guideline range are invalid, provided that the remaining reasons are sufficient to justify the magnitude of the departure.” Id. at 204, 112 S.Ct. 1112.
Insofar as the district court’s methodology would have been “reasonable” had it analogized Jones’ conduct to the use18 of a “dangerous weapon”19 — rather than the “brandishing” of a “firearm” — -we may reduce the district court’s five-level increase accordingly, resulting in a four-level increase for Jones’ “extreme” recklessness. Accord U.S.S.G. § 2A2.2 (providing for a four-level increase where a “dangerous weapon” was used in an aggravated assault). Further, the district court concluded that Jones’ offense level should be increased at least two levels, based on the presence of the other two factors; we agree, and find that a three-level increase *1307would have remained within the boundaries of “reasonableness.”
In light of the above, we conclude that the district court’s seven-level upward departure was reasonable despite the use of an improper analogy; thus, we need not remand to the district court for resentenc-ing. See United States v. O’Dell, 965 F.2d 937, 939 (10th Cir.1992).
III. Conclusion
Based on the foregoing, we AFFIRM the district court’s sentence. Appellee’s motion to file a supplemental memorandum brief is GRANTED.