Narrative:

We were scheduled to operate ZZZ1 to ZZZ2. We as a crew had flown together for 2 days prior and had developed a good working relationship while also looking forward to an uneventful day to conclude our third and final day flying together. Upon arrival at the aircraft I spoke briefly with the inbound crew. The captain stated 'it's a good plane' just prior to leaving for the terminal. We conducted a standard preflight and found nothing unsafe or of concern. The passenger were boarded and we departed the gate area problem free. We taxied to the runway. We were the #1 aircraft holding short of the runway. First officer brought to my attention that the hydraulic system #1 was not indicating a fluid quantity. I reviewed the hydraulic synoptic page with first officer and I concluded that it was an invalid data indication. The hydraulic system #1 quantity block on the synoptic page showed 2 amber dashes while the sides of the block remained green. In addition to the invalid data indication on the block; the hydraulic line to the edp and to the pressure indication block were green. System #1 indicated 3000 psi even after moving the flight controls through their full range of motion several times in rapid succession. Once determining it was an invalid indication and the safety of the flight was not in jeopardy; I decided to continue and to inform maintenance control once we reached our cruise altitude. We were then cleared for takeoff. We departed ZZZ1 on a heading of 360 degrees for vectors on course. Once under way; we established the prescribed climb profile. While passing FL240 climbing to our filed cruise altitude the 'hydraulic 1 lo press' caution message illuminated. We performed the 'hydraulic 1 lo press' QRH procedure which ended with the statement 'land at nearest suitable airport.' I and dispatch determined that ZZZ3 was the best airport to divert to. I notified ATC that we needed to divert and were given vectors to that airport. Once on with ZZZ3 approach I declared an emergency and requested crash fire rescue equipment. We landed and taxied to the gate without further complications.

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Original NASA ASRS Text

Title: A CRJ200 DEPARTED INDICATING NORMAL HYD PRESS BUT ZERO HYD FLUID IN AN ASSOCIATED SYSTEM. DURING CLB HYD PRESS LOW ILLUMINATED. CREW DECLARED AN EMER AND DIVERTED TO NEARBY ARPT.

Narrative: WE WERE SCHEDULED TO OPERATE ZZZ1 TO ZZZ2. WE AS A CREW HAD FLOWN TOGETHER FOR 2 DAYS PRIOR AND HAD DEVELOPED A GOOD WORKING RELATIONSHIP WHILE ALSO LOOKING FORWARD TO AN UNEVENTFUL DAY TO CONCLUDE OUR THIRD AND FINAL DAY FLYING TOGETHER. UPON ARR AT THE ACFT I SPOKE BRIEFLY WITH THE INBOUND CREW. THE CAPT STATED 'IT'S A GOOD PLANE' JUST PRIOR TO LEAVING FOR THE TERMINAL. WE CONDUCTED A STANDARD PREFLT AND FOUND NOTHING UNSAFE OR OF CONCERN. THE PAX WERE BOARDED AND WE DEPARTED THE GATE AREA PROB FREE. WE TAXIED TO THE RWY. WE WERE THE #1 ACFT HOLDING SHORT OF THE RWY. FO BROUGHT TO MY ATTN THAT THE HYD SYS #1 WAS NOT INDICATING A FLUID QUANTITY. I REVIEWED THE HYD SYNOPTIC PAGE WITH FO AND I CONCLUDED THAT IT WAS AN INVALID DATA INDICATION. THE HYD SYS #1 QUANTITY BLOCK ON THE SYNOPTIC PAGE SHOWED 2 AMBER DASHES WHILE THE SIDES OF THE BLOCK REMAINED GREEN. IN ADDITION TO THE INVALID DATA INDICATION ON THE BLOCK; THE HYD LINE TO THE EDP AND TO THE PRESSURE INDICATION BLOCK WERE GREEN. SYS #1 INDICATED 3000 PSI EVEN AFTER MOVING THE FLT CTLS THROUGH THEIR FULL RANGE OF MOTION SEVERAL TIMES IN RAPID SUCCESSION. ONCE DETERMINING IT WAS AN INVALID INDICATION AND THE SAFETY OF THE FLT WAS NOT IN JEOPARDY; I DECIDED TO CONTINUE AND TO INFORM MAINT CTL ONCE WE REACHED OUR CRUISE ALT. WE WERE THEN CLRED FOR TKOF. WE DEPARTED ZZZ1 ON A HDG OF 360 DEGS FOR VECTORS ON COURSE. ONCE UNDER WAY; WE ESTABLISHED THE PRESCRIBED CLB PROFILE. WHILE PASSING FL240 CLBING TO OUR FILED CRUISE ALT THE 'HYD 1 LO PRESS' CAUTION MESSAGE ILLUMINATED. WE PERFORMED THE 'HYD 1 LO PRESS' QRH PROC WHICH ENDED WITH THE STATEMENT 'LAND AT NEAREST SUITABLE ARPT.' I AND DISPATCH DETERMINED THAT ZZZ3 WAS THE BEST ARPT TO DIVERT TO. I NOTIFIED ATC THAT WE NEEDED TO DIVERT AND WERE GIVEN VECTORS TO THAT ARPT. ONCE ON WITH ZZZ3 APCH I DECLARED AN EMER AND REQUESTED CFR. WE LANDED AND TAXIED TO THE GATE WITHOUT FURTHER COMPLICATIONS.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.