Rapid City vs Watertown: Mechanical Engineer Salary (2026)
Compare mechanical engineer salaries between Rapid City, SD and Watertown, SD. All figures are 2026 estimates projected from BLS 2025 data.
Side-by-Side Comparison
| Metric | Rapid City, SD | Watertown, SD |
|---|---|---|
| Median Salary | $96,930▲ | $95,612 |
| Hourly Rate | $46.60▲ | $45.96 |
| Entry Level (P10) | $72,651▲ | $72,320 |
| 25th Percentile | $83,746▲ | $78,976 |
| 75th Percentile | $110,042 | $118,969▲ |
| Top Earner (P90) | $140,630 | $142,682▲ |
| Total Employed | 140▲ | 6 |
Verdict
Rapid City, SD offers better overall compensation for mechanical engineers, winning 3 out of 4 metrics compared to Watertown.
The salary gap between Rapid City and Watertown is $1,318 (1.38%). Rapid City's median is -9.54% compared to the US national median of $107,150.
Salary Range Comparison
The full salary range (10th to 90th percentile) in Rapid City spans $67,979,Watertown spans $70,362. Watertown has a wider pay range, suggesting more variation in pay between entry-level and experienced mechanical engineers.
Cost-of-Living Adjusted Comparison
After cost-of-living adjustment, Rapid City ($108,715 effective) pays 5.52% more than Watertown ($103,030 effective).
Cost-of-living adjustment: salary × (100 / CoL index). Index of 100 = national average.
Which City Is Right for You?
Choose Rapid City if…
- ✓Higher median salary ($96,930/year)
- ✓Larger job market (140 employed)
- ✓Better purchasing power (CoL-adjusted: $108,715)
- ✓You prefer the South Dakota area and lifestyle
Choose Watertown if…
- ✓Better top-earner potential ($142,682)
- ✓You prefer the South Dakota area and lifestyle
Historical Salary Growth Comparison
Based on BLS OEWS metropolitan area data, mechanical engineer salaries in Rapid City grew 20.5% from 2019 to 2025, compared to 22.5% growth in Watertown over the same period.
Rapid City, SD
$78,190 (2019) → $94,180 (2025)
Watertown, SD
$75,847 (2024) → $92,899 (2025)
View Full Salary Data
Rapid City, SD
Watertown, SD
Frequently Asked Questions
Which city pays mechanical engineers more: Rapid City or Watertown?
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Written by Amina Patel, PE
Career Analyst
Amina has 10 years of experience in mechanical engineering. She specializes in thermal analysis and works in the automotive industry.
Methodology & Data Source
All salary figures are 2026 projections based on BLS OEWS May 2025 data. A 2.92% CAGR (derived from 6-year national BLS trends) was applied to estimate current compensation. Cost-of-living adjustments use BEA Regional Price Parity data. Actual salaries vary by employer, certifications, and experience.
Data Sources & Methodology
Source: BLS, OEWS , released .
Compiled and verified by Amina Patel, PE, a licensed mechanical engineer with 10+ years of clinical experience. · View source data at BLS.gov